Question

a stone is realsed from the top of tower of height 20m.then its final velocity just before touching
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Answer 1

Answer:

v=19.6m/s

Explanation:

Initial Velocity u=0

Fianl velocity v=?

Height, s=19.6m

By third equation of motion

v^2=u^2 + 2gs  

v^ 2  =0+2×9.8×19.6

v ^2   =  384.16

⇒v=19.6m/s