A solid sphere moves at a terminal velocity of 20 m s -1 in air at a place where g = 9.8 m s -2 . The sphere is taken in a gravity-free hail having air at the same pressure and pushed down at a speed of 20 m s -1 .

Question

Philoid · Accepted Answer

As it is taken to a gravity free hall, there will be initial acceleration due to gravitation downwards. Hence, (A) is untrue.

The viscous force due to ball's velocity will produce an upwards acceleration of . So option (B) is true.

As the ball moves, the viscous force increases, hence the velocity decreases. This will in turn decrease the acceleration of the ball. So option (C) is true.

Due to the drag force, the ball will eventually lose its energy to the surroundings and come to a complete halt. Option (D) is also true.

A solid sphere moves at a terminal velocity of 20 m s-1 in air at a place where g = 9.8 m s-2. The sphere is taken in a gravity-free hail having air at the same pressure and pushed down at a speed of 20 m s-1.

A solid sphere moves at a terminal velocity of 20 m s^-1 in air at a place where g = 9.8 m s^-2. The sphere is taken in a gravity-free hail having air at the same pressure and pushed down at a speed of 20 m s^-1.