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Q.

A ball of mass 2kg and another of mass 4kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of

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a

2 : 1

b

1 : 4

c

1 : 2

d

1 : 2

answer is C.

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Detailed Solution

Kinetic energy =12mv2As both balls are falling through same height therefore they possess same velocity.but  KE∝m         (If v = constant)∴KE1KE2=m1m2=24=12
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