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Question

(A) Let the upward direction be positive.For ball $A$: Initial velocity $u_A = 10 \, m/s$,acceleration $a_A = -g$.The velocity of ball $A$ at time $t$

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$10 \, m/s$

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(A) Let the upward direction be positive.For ball $A$: Initial velocity $u_A = 10 \, m/s$,acceleration $a_A = -g$.The velocity of ball $A$ at time $t$ is $v_A = u_A + a_A t = 10 - gt$.For ball $B$: Initial velocity $u_B = 0$,acceleration $a_B = -g$.The velocity of ball $B$ at time $t$ is $v_B = u_B + a_B t = 0 - gt = -gt$.The relative velocity of $A$ with respect to $B$ is $v_{AB} = v_A - v_B$.Substituting the values: $v_{AB} = (10 - gt) - (-gt) = 10 - gt + gt = 10 \, m/s$.Thus,the speed of $A$ relative to $B$ is $10 \, m/s$.

Ball $A$ is thrown vertically upward with a speed of $10 \, m/s$. At the same instant,another ball $B$ is released from rest at a height $h$. At time $t$,the speed of $A$ relative to $B$ is ...........

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