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(a) A ball is thrown vertically upward w...

(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.

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