A ball A is thrown vertically upwards with speed u. At the same instant another ball B is released from rest at height h. At time t, the speed of A relative to B is

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u - 2gt

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\sqrt{u^{2} - 2 g h}

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2 u

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Solution

The correct option is A u
velocity of ball A is at any t $v_{A} = u - g t$
velocity of ball B is released from height h at any time t $v_{B} = - g t$
speed of A relative to B is $v_{A / B} = v_{A} - v_{B} = u - g t - (- g t) = u$
Hence the correct answer is B

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A

10 m / s

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(T a k e g = 10 {m s}^{- 2})

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