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JEE Main Physics question

PhysicsMotion in a Straight LineJEE Main

A ball falls from height . After 1 second, another ball falls freely from a point 20 m below the point from where the first ball falls. Both of them reach the ground at the same time. What is the value of

Answer: (C)

Solution

(ball 1's total time ). Ball 2 falls for s from height :

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Question ID VK-152428