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Question

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

A
ut
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B
12gt2
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C
ut12gt2
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D
(u+gt)t
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Solution

The correct option is A 12gt2
Let time of flight be T then T=ug
Let h be the distance covered during last 't' second of its ascent
Velocity at point B=VB=ug(Tt)
=ug(ugt)=gt
h=VBt12gt2h=gt212gt2=12gt2

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