Question

A stone is thrown vertically upwards with a velocity of 42 metre per second find its velocity at the end of 3 seconds.
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Answer 1

Answer:

The final velocity of the stone after 3 seconds is 12.6 m/s

Explanation:

initial velocity, u = 42 m/s

time taken, t = 3 seconds

acceleration due to gravity, a = - 9.8 m/s^2 ....... ( - 9.8 because the stone is going in upwards direction.)

final velocity , v = ?

v = u + at ( 1st Equation of Motion )

v = 42 + (-9.8)(3)

v = 42 - 29.4

v = 12.6 m/s

Therefore , the final velocity of the stone after 3 seconds is 12.6 m/s

I hope it helps you . If you have any doubts, then don't hesitate to ask.