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v= 120m/s
t=0,3s
m=?
Fxt = m (vt-vo)
200 x 0,3 = m (120-0)
60 = m x 120
m = 0,5 kg
t=0.3=3x10-¹
f=200 N
m=?
f•t=m(vt-vo)
200•3x10-¹=m(120-0)
m=[200•3x10-¹]/120
m=60/120
m=0.5 kg