<p>I took it to mean that m2 alone is 12 kg, it says the mass of the wagon and box total is 12, so (m1 + m2) =6 +12 = 18kg</p>
<p>I took it to mean that m2 alone is 12 kg, it says the mass of the wagon and box total is 12, so (m1 + m2) =6 +12 = 18kg</p>