Question : A ball 𝐴 is thrown up vertically with speed 𝑢 and at the same instant another ball 𝐵 is released from a height ℎ. At time 𝑡, the speed of 𝐴 relative to 𝐵 is
(A) 𝑢
(B) 2𝑢
(C) 𝑢 − 𝑔t
(D) \left( u^{2}-gt\right)
Answer : option (A)
Solution :
A ball 𝐴 is thrown up vertically with speed 𝑢 and at the same instant another ball 𝐵 is released from a height ℎ. At time 𝑡, the speed of 𝐴 relative to 𝐵 is
with
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