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On increasing the speed of a bosy to 2ms...

On increasing the speed of a bosy to `2ms^(-1)`, its kinetic energy is quadrupled. Then is original speed must be

A

`0.25 ms^(-1)`

B

`1 ms^(-1)`

C

`4 ms^(-1)`

D

`2ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
`(2)`
`K = 1/2 Mv^(2) and 4K = 1/2 M(v + 2 )^(2)`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE - 1 (C.W)
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