This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   A girl holding a ball is on a skateboard at rest.  A moment later, she threw the ball over to her friend.  Ignore friction,  

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A child starting from rest slides down each of the four slides A to D. Each has the same vertical height.  Consider friction and air resistance, Which one has the highest velocity when the child reaches to the bottom

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   You are sitting on a Merry-go-round.  Which location you sit will provide you with the greatest angular speed?  

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   Select the reason why the barrel is at the exit of a highway.  

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   Sitting on a circling Ferris wheel.  The work done by the centripetal force on you is

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A roller coaster traveling on a track as shown below. Disregard rotational motion and air resistance.  When the cart is at point A speeding up,  

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   Jenny brought some balloons for her mom’s birthday party.  She tied the balloons at the back of her convertible.  She waved good bye to her boy friend and started the engine.  As she drove forward,

This is an original exam question by Prof Kay Han. It is forbidden to photograph, upload, download, copy, or share this problem with anyone, or to post it to any website.   Calculate the average speed (in m/s) of an antelope that runs [x]  m in [y]  seconds

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A [x]-kg cart is moving forward at [y] m/s on a frictionless surface. Then you apply a [a]-N forward force on it for [b] seconds in the same direction. Use impulse-momentum considerations to calculate the final speed of the car.

This is an original exam question by Prof Kay Han.  It is forbidden to photograph, upload, download, copy or share this problem with anyone, or to post it onto any website.   A roller coaster drops from a high point of the track.  On the way down, the mechanical energy