Ball $A$ is thrown up vertically with speed $10 m / s$ . 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

10 m / s

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10 - 2 g t

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\sqrt{10^{2} - 2 g h}

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10 - g t

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Solution

The correct option is D $10 m / s$
$u_{A} = 10, u_{B} = 0, a_{A} = - g, a_{B} = - g$
$u_{A B} = 10, a_{A B} = 0$
$v_{A B} = u_{A B} + a_{A B} t$
$v_{A B} = 10 m / s$

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Ball A is thrown up vertically with speed 10 m/s. 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

The correct option is D 10 m/suA=10, uB=0 , aA=−g ,aB=−guAB=10 , aAB=0vAB=uAB+aABtvAB=10m/s

Ball $A$ is thrown up vertically with speed $10 m / s$ . 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

The correct option is D $10 m / s$
$u_{A} = 10, u_{B} = 0, a_{A} = - g, a_{B} = - g$
$u_{A B} = 10, a_{A B} = 0$
$v_{A B} = u_{A B} + a_{A B} t$
$v_{A B} = 10 m / s$