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How fast should a student of mass 50 kg...

How fast should a student of mass 50 kg run , so that his kinetic energy becomes 625 J ?

A

`12.5` m/s

B

`2.5` m/s

C

`50 . 0 `m/s

D

`5.0` m/s

Text Solution

Verified by Experts

The correct Answer is:
D
Kinetic energy
`K =1/2 mv^(2)`
` :. (2K)/m = v^(2)`
` :. v = sqrt((2K)/m) = sqrt((2xx625)/50) =sqrt(25)`
` :. V = 5.0` m/s
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