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JEE Main Physics question

PhysicsMotion in a Straight LineJEE Main

A balloon going upward with a velocity of 12 ms is at a height of 65 m from the earth's surface at any instant. Exactly at this instant a ball drops from it. How much time will the ball take in reaching the surface of the earth? ( ms)

Answer: (A)

Solution

At the instant of release the ball shares the balloon's upward velocity, ms. Taking upward positive with the release point as origin, ground is at

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Question ID VK-151905