Which of Newton's motion laws BEST explains HOW a rock accelerates when it is dropped off a bridge?

A.
first

B.
second

C.
third

Can anybody me with this? ? (picture included.)

Explain what will happen if decomposers were apsent from a forest ecoysystem.

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?