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Question

The pendulum ball of mass m1 is let to swing from a height h. It strikes and sticks to the pendulum ball m2, which is at rest. The combination then swings to a height h3, then m2 in terms of m1 is

A
17.32m1
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B
1.732m1
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C
0.732m1
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D
m1
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Solution

The correct option is C 0.732m1
Velocity of m1 before colliding m2=2gh
using momentum conservation

m1×2gh=(m1+m2)2gh3

3m1=m1+m2

(31)m1=m2

m2=0.732m1

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