A ball is thrown vertically with some velocity . A constant air resistance acts. If the time of ascent is `t_(1)` and that of descent is `t_(2)` , then

The relation between time of ascent t_a and time of descent t_d is

A body is projected up along the rough inclined plane from the bottom with some velocity. It travels up the incline and then returns back. If the time of ascent is t_(a) and time of descent is t_(d) then

A body is projected up along the rough inclined plane from the bottom with some velocity. It travels up the incline and then returns back. If the time of ascent is t_(a) and time of descent is t_(d) then

A ball is thrown vertically upwards from the ground. Work done by air resistance during its time of flight is

A ball is thrown vertically upwards. Assuming the air resistance to be constant and considerable,

In the following problems the air resistance is constant (air resistance always opposes the motion). (a) A ball is thrown vertically upward. If time of ascent is t_(1) and time of descent is t_(2) , which time is greater ? (b) A ball is thrown vertically upward with speed u and on returning to the ground, its speed is v_(0) . Which speed is greater ? (c) Two balls A and B (m_(A) gt m_(B)) are thrown vertically upward with same speed. Which ball A or B (heavier or lighter) wil attain greater height ?

(a) A ball is thrown vertically upward with speed 10 m//s and it returns to the ground with speed 8 m//s . Find the maximum height attained by the ball. (b) A ball is thrown vertically upward and if air resistance is half of weight of the ball, find the ratio of time of ascent and time of descent. (C) Two balls A and B (m_(A) = 2 m_(B) = 2 m) are thrown vertically upward. If air resistance is mg//2 , find ratio of maximum height attained by them.

If a ball is thrown vertically upwards with speed u , the distance covered during the last t second of its ascent is