1769

Physics Kinematics Level: High School

A 2000 kg car is slowed down uniformly from 20.0 m/s to 5.00 m/s in 4.00 s

a) What average force acted on the car during that time ?

b) How far did the car travel during that time ?




1768

Physics Kinematics Level: High School

A freight train has a mass of 1.5 x 10 to the seventh power kg . If the locomotive can exert a constant pull of 7.5 x 10 to the fifth power N , how long does it take to increase the speed of the train from rest to 80 km/h ?



1766

Physics Kinematics Level: High School

Projectile motion

A small sphere of mass M = 0.875 kg is launched with an initial speed of v = 15.00 at an angle , with respect to the horizontal , of x = 25.00 degrees . The sphere is launched off a cliff a distance h = 30.00 m above ground level . Find

a) The maximum height above the ground attained by the sphere .

b) The speed of the sphere as it strikes the ground

c) The speed of the sphere the “top” of its path .




1759

Physics Kinematics Level: High School

One dimensional

You stands at the top of a cliff while your friend stands on the ground below you . You drop a ball from rest and see that it takes 1.2 s for the ball to hit the ground below . Your friend then picks up the ball and throws it up to you . such that it just comes to rest in your hand . What is the speed w/which your friends threw the ball ?



1757

Physics Kinematics Level: High School

Equation of Motion

A person jumps from a 4th story window 15 m above a firefighter’s safety net . The survivor stretches the net 1.0 m before coming to rest .

a) What was the average deceleration experienced by the survivor when she was slowed to rest by the net ?

b) What would you do to make it “safer” (that is to generate a smaller deceleration ) would you stiffen or loosen the net ? explain .




1756

Physics Kinematics Level: High School

At the left the in the figure (at “click here”) we see a sandbag being dropped from a balloon . At the moment the sandbag is dropped , the balloon is moving upwards at 10 m/s . Why would some people believe that the motion is as depicted in the centre and others believe that the motion is as depicted at the right .

Give as many reasons as possible fro each viewpoint) . Which picture is correct from an experiment point of view ?




1755

Physics Kinematics Level: High School

A barge with a mass 150 MG is proceeding down river at 6.20 m/s in heavy fog when it collides broadside with a barge heading directly across the river . The second barge has mass 278 MG and was initially moving at 4.30 m/s . Immediately after the impact , the second barge find its course deflected by 18 degrees in the down river direction and speed increases to 5.10 m/s . At the site of collision the river had broadened sufficiently that its current was negligible compared with the barge speeds .



1754

Physics Kinematics Level: High School

Projectile motion

A 2.05m tall basketball player takes a shot when he is 6.02 m from the basket (at the three-point line) . If the launch angle is 25 degree and the ball was launched at the level of the player’s head . What must be the release speed of the ball for the player to make the shot ? The basket is 3.05 m above the floor .



1753

Physics Kinematics Level: High School

Projectile motion

A ditch 2.5 m wide crosses a trail bike path . An upward incline of 15o has been built up on the approach so that the top of the incline is level with the top of the ditch . what is the minimum speed a trial bike must be moving to clear the ditch ? (Add 1.4 m to the range for the back of the bike to clear the ditch safely )



1752

Physics Kinematics Level: High School

Resultant velocity

A boat that travels at the speed of 6.75 m/s in still water is to go directly across a river and back . The current flows at 0.50 m/s

a) At what angle must the boat be steered ?

b) How long does it take to make the round trip ?

(Assume that the boats speed is constant at all times , and neglect turnaround time . )



1751

Physics Kinematics Level: High School

Relative velocity

While you are traveling in a car on a straight, level inter-state highway at 90 km/h, another car passes you in the same direction ; its speed meter reads 120 km/h .

a) What is your velocity relative to the other driver ?

b) What is the other car’s velocity relative to you ?




1750

Physics Kinematics Level: High School

Two dimensional motion

A roller coaster at an amusement park starts out on a level track 50.0 m long and then goes up a 25.0 m incline at an angle of 30 degree to the horizontal . It then goes down a 15.0 m ramp with an incline of 40 degrees to the horizontal . When the roller coaster has reached the bottom of the ramp , what is its displacement from the starting point ?



1748

Physics Kinematics Level: High School

Two dimensional motion

A particle moves as at speed of 2.5 m/s in the +x direction . Upon reaching the origin . the particle receives a continuous constant acceleration of 0.75 m/s^2 in the –y direction . What is the position of the particle 4.0 s later ?



1624

Physics Kinematics Level: High School

A car traveling at 20 m/s is brought to a halt by applying the brakes in 4s , what is the magnitude of acceleration of the car ?

a) 4 m/s^2

b) 3 m/s^2

c) 5 m/s^2

d) 2 m/s^2




1560

Physics Kinematics Level: High School

Projectile motion

Suppose you were on top of a cliff of height h , and threw a ball horizontally with speed v , How far would it go before it hits the ground ? (Ignore air resistance) (ie, what is the formula that describes range in terms of horizontal speed and height ?)

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