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A dumbell consisting of two masses m each, connected by a light rigid rod of length l, falls on two pads of equal height, one steel and the other brass through a height h. The coefficients of restitution are e1 and e2 (e1< e2). To what maximum height will the centre of mass of the dumbell rise after bouncing off the pads?

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a

b

c

d

answer is B.

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The centre of mass of the system after collision will move up with velocity atHence, (2) is the correct choice

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A dumbell consisting of two masses m each, connected by a light rigid rod of length l, falls on two pads of equal height, one steel and the other brass through a height h. The coefficients of restitution are e1 and e2 (e1< e2). To what maximum height will the centre of mass of the dumbell rise after bouncing off the pads?