Draw the speed-time graph of a ball falling from a certain height, it touched the ground after 5.0 seconds. Ignore air resistance and earth's accerelation is 10m/s^-2, find the starting height of the ball.
Is it 125 meters?
x = xo + vo t + 1/2 a t2 x = 0 ( the ground level) xo = original height of the ball
vo = original velocity = 0 a = -10 m/s2 t = 5
0 = xo - 1/2 (10) (52)
xo = 125 m
Thanks very much!
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