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Question

For an object, dropped from a height of 16 m, the ratio of its kinetic energy and potential energy above the ground at half the height is

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

The correct option is D 1 : 1
At half the height, the ball will be 8m away from the ground, then at point 'B' P.E.=mgh=8mg
From third equation of motion we have,v2u2=2as,s=8u=0, since object is dropped from restv2=2g×8v2=16gK.E. is given asK.E=12mv2Substituting the value of v in K.E., we getK.E.=12×m×16g=8mgSo ratio of potential and kinetic energy isK.E:P.E=1:1

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