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A ball is thrown with initial energy 100...

A ball is thrown with initial energy 100J at an angle `theta` to the horizontal . If its energy at the top becomes 30 J then angle of projection-

A

`theta=45^(@)`

B

`theta=30^(@)`

C

`theta=cos^(-1)(3//10)`

D

`theta=cos^(-1)(3//10)^(1//2)`

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The correct Answer is:
D
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  17. One second after the projection, a stone moves at an angle of 45^@ wi...

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