A tennis balls in the air and the potential energy increases. At the same time, it’s kinetic energy___because the velocity a.) increases;increases
b.) decreases; increases
c.) decreases;decreases
d.) increases;decreases

The slotted link is pinned at o, and as a result of rotation it drives the peg p along the horizontal guide. compute the magnitude of the velocity and acceleration of p along the horizontal guide. compute the magnitudes of the velocity and acceleration of p as a function of θ if θ=(3t) rad, where t is measured in seconds.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?