A ball A is thrown vertically upward 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 (Assume both are in the air)

Question

A ball A is thrown vertically upward 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 (Assume both are in the air), u, u - 2 g t, u 2 - 2 g h, u − g t

MARKS App · Accepted Answer

From equation of motion, we have v = u + gt where u is initial velocity and t is time. For ball A, v A = u − gt For ball B, v B = 0 + gt ∴ Relative speed Δ v → = v A → − v B → = u - gt j ^ - + gt j ^ = u − 2gt j ^

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