First slide

Vertical projection from ground

Question

A body is projected up with a velocity 50ms^-1 after one second if accelaration due to gravity disappears then body

Easy

A

floats in air
B

continue to move up with constant velocity
C

continue to move up with acceleration
D

goes up and falls down

Solution

Since upward motion of the body is retarded motion, from v = u - gt, after one second its velocity will be v = (50 -10 x 1)m/s = 40m/s, so when gravity disappears the body will continue to move up with constant velocity of 40m/s.

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