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Refer Q.107. What is the velocity of bol...

Refer `Q.107`. What is the velocity of bolt relative to lift `B` when it hits the floor of `A` ?

A

`18 m//s`

B

`20 m//s`

C

`22 m//s`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Velocity of bolt at `4 s` :
`v_b = 20 - g xx 4 = -20 m//s `
=`20 m//s` downward
Velocity of lift `B` at `4 s` :
`v_B = 10 - 2 xx 4 = 2 m//s` downward.
So relative velocity
=`v_(b//B) = 20 - 2 = 18 m//s`.
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