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What is the maximum height of a stone th...

What is the maximum height of a stone thrown vertically upwards if its velocity is halved in 2 second ?

A

20 m

B

40 m

C

80 m

D

100 m

Text Solution

Verified by Experts

The correct Answer is:
c
Here let .h. be the max height and u be the velocity of thrown, then
`h=(u^(2))/(2g)`
Also v=u+at
`u/2=u-gxx2`
=`u-10xx2`
or u=40 `ms^(-1)`
`:. H=(40xx40)/(2xx10)=80 m`
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