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If a projectile is projected at 30 degrees o the horizontal reaches the ground two seconds after projection, the change in velocity in that time interval is
With what velocity it is projected it will reach the ground with same velocity. If it is projected with usinxi^+u cosxj^ it reaches the ground with -usinxi^+ucosxj^ if we find the difference 2usinxi^. We know x=30 if we sub init we get ui^
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