There are some instances where it is appropriate to apologize before, during, or after a speech.

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 chinchilla is running with a velocity v.  A lab rat with half the mass is also running with v.  Compare the kinetic energy.

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.   Where is the center of Mass of the following item?  The black dot represents the location of the center of mass.

What advice is given for rehearsing your speech?

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 roller coaster traveling on a track as shown below. Disregard rotational motion and air resistance.  When the cart is at point D coming down,

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.   In a football game, Benny kicks the ball and it travels in a parabola trajectory.  As it moves along this path,

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 roller coaster traveling on a track as shown below. Disregard rotational motion and air resistance.  When the cart is at point C the highest point,

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 few objects rolling down a wedge with a height H, as shown below.  The all have the radius R and the same mass M, except indicated by small (< R, < M) or large (> R, > M).  Select the last one that will arrive at 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 onto any website.   Two cars moving toward each other and collided.  After the collision, the two cars coupled and move together.  The momentum of the two car system 

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 deer is stranded on a frozen pound.  Suddenly, it coughs up a piece of twig it swallowed earlier.  The piece of twig flies forward at 2 m/s.  In which direction will the deer move.