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This is the standard expression for the ACCELERATION due to gravity.

Acceleration is the change in speed per second.

If there is no friction or air resistance then a body falling from rest will reach a speed of 32.2 fps after 1 second, after 2 secs it will be travelling at 64.4. fps, at 96.6 fps after 3 secs ....and so on.

In Mechanics there is an expression for motion involving constant acceleration :-

v = u + ft, where v = velocity after a period of time, u = initial velocity, f = acceleration and t = time.

In the question, after 3 seconds this formula would produce :-

v = 0 + 32.2 x 3 = 96.6 fps.

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16y ago

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