Physics

6 August, 01:48

An object falls freely from rest near the surface of the Earth. What is the speed of the object when it has fallen 4.9 meters from its rest position?

a) 4.9m/s

b) 96 m/s

c) 9.8 m/s

d) 24m/s

I know that it is letter "c" but I don't know why.

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