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Q.

A 2kg body is projected vertically upwards with a velocity of 100ms−1 from ground .The ratio of potential energies 4s and 2s after projection is g=10ms−2

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a

9:16

b

4:1

c

16:9

d

1:4

answer is C.

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Detailed Solution

U=mg=mgut−12gt2U2U1=mg100×4−12×10×16mg100×2−12×10×4U2U1=320180=169
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