# Physics

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A stone is thrown vertically up word by up word by a boy . It returns to his hands in 3sec . How high does the stone rise ?

• Physics -

top at 3/2 = 1.5 s = t

v = Vi - g t
0 = Vi - g t
so
g t = Vi = 9.81 * 1.5 = 14.7

h = Vi t -4.9 t^2
= 14.7 *1.5 - 4.9(2.25)
= 22 - 11 = 11 meters

note, same as average speed = 14.7/2 times 1.5 seconds

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