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A ball is dropped from height 10 m. Ball is embedded in sand 1 m and stops, then

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a
Only momentum remains conserved
b
Only kinetic energy remains conserved
c
Both momentum and K.E. are conserved
d
Neither K.E. nor momentum is conserved
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detailed solution

Correct option is A

Momentum of earth-ball system remains conserved.


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Two bodies having same mass 40 kg are moving in opposite directions, one with a velocity of 10 m/s and the other with 7 m/s If they collide and move as one body, the velocity of the combination is (m/s)

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