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A ball whose kinetic energy is E , is pr...

A ball whose kinetic energy is `E` , is projected at an angle of `45(@)` to the horizontal . The kinetic energy of the ball at the highest point of its flight will be

A

zero

B

`k`

C

`(k)/(sqrt(2))`

D

`(k)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
At the top of trajectory,
`K'=(1)/(2)m(u cos theta)^(2)`
`=(1)/(2)mu^(2).cos^(2)45^(@)=(k)/(2).`
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