First slide
Vertical projection from ground
Question

A body is projected vertically up with velocity 98 ms-1. After 2 s if the acceleration due to gravity of earth disappears, the velocity of the body at the end of next 3 s is

Easy
Solution

Velocity at t = 2

v = u +at = 98 - 9.8 x 2 = 98 -19.6

v= 78.4 m/s

speed remains same at t= 3

\because a=0\

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