Physics
posted by Anonymous .
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 ?

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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