There are two carts let's call them M1 and M2. M1 is 4.0 kg, and M2 is 2.0 kg.
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For M1:
F= m*a
F/m = a = 2.0/4.0 = 0.5 s^(-2)
For M2:
F = m*s
F/m = a = 2.0/2.0 = 1 s^(-2)
F= m*a
F/m = a = 2.0/4.0 = 0.5 s^(-2)
For M2:
F = m*s
F/m = a = 2.0/2.0 = 1 s^(-2)
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F=ma
2.0=(4+2)a
2.0/6=a
a=1/3m/s^2.
2.0=(4+2)a
2.0/6=a
a=1/3m/s^2.