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A projectile has initially the same hori...

A projectile has initially the same horizontal velocity as it would acquire if it had moved from rest with uniform acceleration of `4 ms^-1` for half a minute. Ir the maximum height reached by it is 180 m, then the angle of projection is (Take `g=10 m s^-2`)

A

`tan^-1 (1/3)`

B

`tan^-1 (0.5)`

C

`tan^-1 (0.8)`

D

`sin ^-1 (4/9)`

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