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In the following problems the air resist...

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 ?

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