A projectile fired at 30° to the ground is observed to be at same height at time 3 s and 5 s after projection, during its flight. The speed of projection of the projectile is m s" 1 . (Given g = 10 m s -2 )
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(80)
The time taken to reach maximum height is
The total time of flight is T = (3 + 5) s = 8 s.
Hence,
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