First slide

Vertical projection from ground

Question

A body is thrown vertically upward from a point on ground. The body reaches a height above the ground at times t = 3 sec and t = 6 sec. Then velocity of projection is

Moderate

A
20 m/s
B
40 m/s
C

45 m/s
D
30 m/s

Solution

v=u+at
The velocities at t=3m/s and t=6 m/s will be equal and opposite.
hence u-3g= 6g-u
9g= 2u
u= 45m/s

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