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:
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a
250
b
300
c
450
d
600
answer is B.
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Detailed Solution
h = u2sin2θ2g = (56)2sin2θ19.6sin2θ = 40×19.6(56)2 = 14sinθ = 12 or θ = 300