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Questions  

The ceiling of a hall is 40 m high. For maximum horizontal distance, the angle at which the ball may be thrown with a speed of 56 ms-1 without hitting the ceiling of the hall is

a
25°
b
30°
c
45°
d
60°

detailed solution

Correct option is B

h=u2sin2⁡θ2g=(56)2sin2⁡θ19.6 sin2⁡θ=40×19.6(56)2=14sin⁡θ=12 or θ=30∘

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