由F=ma a1=F1/m a2=F2/m
x1=1/2a1t^2 =1/2F1t^2 x2=v1t-1/2a2t^2=F1t^2/m-1/2F2t^2/m
x1=-x2
F2=3F1
W1=F1X1 W2=F2X2=3F1X1
W=W1+W2=EK-0=200J
W1=50J W2=150J
由F=ma a1=F1/m a2=F2/m
x1=1/2a1t^2 =1/2F1t^2 x2=v1t-1/2a2t^2=F1t^2/m-1/2F2t^2/m
x1=-x2
F2=3F1
W1=F1X1 W2=F2X2=3F1X1
W=W1+W2=EK-0=200J
W1=50J W2=150J