Question

A person drops the ball from the top of a building. Taking air resistance into account, which of the following best describes the speed of the ball during its downward motion?

• A. It will increase until it reaches the speed of light
• B. It will increase at a steady rate
• C. It will remain constant
• D. It will decrease
• E. Its rate of acceleration will decrease until the ball moves at a constant speed

Answer 1

The correct option is E Its rate of acceleration will decrease until the ball moves at a constant speed

When ball falls its speed goes on increasing first due to gravitational acceleration but due to air resistance an opposing upward force also goes on increasing , that will decrease the rate of acceleration , after some time air resistance and weight of ball will be equal to each other and now there is no net force to accelerate the ball so ,ball comes down with a constant velocity ,called terminal velocity.