Aball is dropped from the top of the building. it initially moves at 4.0 m/s after 0.5 seconds it moves at 3.8m/s what force is responsible for the slowing of the ball

The correct answer is

Air resistance

In fact, when a ball is in free fall, there are two forces acting on it:

- its weight (force of gravity), acting downward

- the air resistance, acting upward

The effect of the weight is to accelerate the ball, because its direction is the same as the direction of motion of the ball, while the effect of the air resistance is to slow down the ball, because its direction is opposite to that of the motion.

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