JEE Main Physics question
The bob of a simple pendulum (mass m and length l), dropped from a horizontal position, strikes a block of the same mass placed on a horizontal frictionless table, elastically. The K.E. of the block after collision will be
Answer: (C)
Solution
The bob's PE at the horizontal release position is mgl, which converts entirely to KE = mgl at the bottom. In an elastic collision between two equal masses, with
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