Question

a ball is dropped from the top of a building. it initially moves at 4.0 m/s. after 0.5 seconds, it moves at 3.8 m/s. what force is responsible for the slowing of the ball? air resistance gravity normal tension

Explanation:

The ball is dropped and slows down. Gravity pulls it down, normal force is for contact with surfaces (not here), tension is for strings/ropes (not here). Air resistance opposes motion through air, causing slowing. So air resistance is the force slowing the ball.

Answer:

A. air resistance