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From the top of a multi-storeyed buildin...

From the top of a multi-storeyed building 40m tall, a boy projects a stone vertically upwards with an initial velocity of` 10 ms^(–1) `such that it eventually falls to the ground.

A

(1) After 4 s the stone will strike the ground

B

(2) After 2 s the stone will pass through the point from where it was projected

C

(3) Its velocity when it strikes the ground is 30 m//s

D

(4) Its velocity when it strikes the ground is 40 `m//s `

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