Two bodies of same mass are moving with velocities in the ratio 1:2 respectively. What will be the ratio of their kinetic energies?
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Answer:
1:4
Explanation:
let the velocities be 1y and 2y
kinetic energy of 1st one = 1/2mv²
=1/2m.(1y)²
=1/2my²
kinetic energy of 2nd object= 1/2mv²
=1/2m.(2y)²
=1/2m.4y²
=2my²
ratio=( 1/2my²) / ( 2my²)
= 1/4
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