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Question

Two objects of masses, 1×103 kg and 4×103 kg have equal momentum. What is the ratio of their kinetic energies?

A
2:1
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B
4:1
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C
1:5
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D
1:3
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Solution

The correct option is B 4:1
We know that,
KE=p22m

For a constant momentum,
KE1m
KE1KE2=m2m1
KE1KE2=4×1031×103=41=4:1

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