1.a bullet fired from a rifle,attains a maximum height of 25m and crosses a range of 200m.find the angle of projection.

2.find the range of ball,which when projected with a velocity of 29.4 m/s just passes over a pole 4.9 m high.

3.a projectile is thrown from a point 39.2 m away from the foot of a building 19.6m high and just reaches the top horizontally .find the velocity of projection and the angle of throw.

1) We know maximum height 

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1. R*tan(A) = 4H. here R is range, A is angle of projection and H is max. height.

tan(A) = 1/2.

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