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A body of mass 1 kg accelerates uniforml...

A body of mass 1 kg accelerates uniformly from rest to a velocity of `1 m s^(-1)` in 15 seconds. At what time the kinetic energy of the body will be `2/9 J` ?

A

4s

B

8s

C

10s

D

12 s

Text Solution

Verified by Experts

The correct Answer is:
C
`a = (1 - 0)/(15) ms^(-2) = 1/15 ms^(-2)`
Also, `1/2 xx 1 xx v^2 = 2/9 or v = 2/3 ms^(-1)`
Now, `2/3 = 0 + 1/15 xx t " or " t = 10 s`
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