Question
Explain why a parachute is invariably used, while jumping from an aeroplane.
Solution
A parachute while descending through air experiences large viscous force as a result of it's large structure. As the body is falling down, drag force is created opposing the motion. This balances out the gravitational force acting downwards. The terminal velocity of the falling object decreases as a result. Hence, a person landing would not get hurt.
