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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

Answer» Correct Answer - 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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