m = 4кг
S=vot+at^2/2
2=0,1*5+a*5^2/2 5^2/2=12,5
1,5=12,5a
a=1,5/12,5=0,12 м/с^2
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Q=I^2*R*dt
Q=2^2*6*60=1440Дж