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vt" = vo"-2gs
0 = 100-20s
s=5m
ep = mgh
= 5.10.5
250joule
M = 5 kg
Vo = 10 m/s
g = 10 m/s^2
h= 1/2 g
h= 1/2. 10
h= 5
dit : Ep ?
peny : Ep = m.g.h
Ep = 5.10.5
Ep = 250 joule