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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?

 Sep 18, 2020
 #1
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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

 Sep 18, 2020
 #2
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Thanks very much!

Guest Sep 18, 2020
 #3
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You are welcome ! cheeky

ElectricPavlov  Sep 18, 2020

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