A body is projected from the earth at angle 300 with the horizontal with some initial velocity. If its range is 20 m , the maximum height reached by it is : (in metres)

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103

answer is B.

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Detailed Solution

R=u2sin2θg ∴ 20=u2sin(2×300)g ⇒ u2g=20sin600=203×2=403 Now, H=u2sinθ2g =403×sin23002 =403×(12)22 =53m

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