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A body is projected at an angle 60^@ wit...

A body is projected at an angle `60^@` with horizontal with kinetic energy K. When the velocity makes an angle `30^@` with the horizontal, the kinetic energy of the body will be

A

`K//2`

B

`K//3`

C

`2K//3`

D

`3K//4`

Text Solution

Verified by Experts

The correct Answer is:
B
`v_x = u_x`
`:. v cos 30^@ = u cos 60^@`
or `v= u/sqrt(3)`
Velocity has become `1/(sqrt3)` times. Therefore, kinetic energy will become 1/3 times.
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