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2015-08-11T21:33:05+05:30
U = 120 m/s
v = 0
t = 0.01 s

a = (v-u)/ t = -120 / 0.01 = -12000 m/s

a) S = (v² - u²)/2a = -120² / 2*(-12000) = 120 / 200 = 0.6 m
distance of penetration is 0.6m

b) force = ma = 0.005×12000 = 60N
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