a stone is dropped from a height of 20m how long will it take to reach the ground? what will be the speed when it hits the ground.
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Initial velocity = 0 m/s
Height = 20 m
Final velocity = v
g= 10m/s^2
By equation of free fall,
v^2=2gh
=2×10×20
=400
v=20 m/s
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