1.

The launching speed of a certain projectile is five times the speed it has at its maximum height.Its angles of projection isA. `theta=cos^(-1)(0.2)`B. `theta=sin^(-1)(0.2)`C. `theta=tan^(-1)(0.2)`D. `theta=0^(@)`

Answer» Correct Answer - A
`u=5u sin theta rArr cos theta=1/5`


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