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A person drops a stone from a building o...

A person drops a stone from a building of height 20 m. At the same instant the front end of a truck passes below the building moving with constant acceleration of `1 m//s^(2)` and velocity of `2 m//s` at that instant. Length of the truck if the stone just misses to hit its rear part is :-

A

`6 m`

B

`4 m`

C

`5 m`

D

`2 m`

Text Solution

Verified by Experts

The correct Answer is:
A
Time of fall of stone `=sqrt((2xx20)/10)=2` sec
Horizontal displacement of truck in 2 sec
`rArr S=2xx2+1/2xx1xx4`
Length of truck `=6m`
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