The velocity of fall of a man jumping with a parachute first increases and then becomes constant. Explain.

Explanation

As man jumps out from a height in air with a parachute , its velocity increases first, because the gravity pull dominates the viscous drag and bouyancy of air which oppose the motion. As the velocity increases, the viscous drag of air also increases and soon a stage is reached where viscous drag and buoyancy of air balances the gravity pull. then the man with a parachute falls with a constant velocity,called terminal velocity.