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A stone of 200 g is thrown vertically up...

A stone of 200 g is thrown vertically upward at, a velocity of 60 m/s. The kinetic energy of the stone after 7 s will be `(g = 10 m//s^2)`

A

5 J

B

10 J

C

15 J

D

20 J

Text Solution

Verified by Experts

The correct Answer is:
B
From equation `v = u - g t`
` v = 60 - 10 xx 7 = -10 m//s`
`therefore KE = 1/2 mv^2 = 1/2 xx 0.2 xx (-10)^2 = 10 J`
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