nina has a mass of 40 kg and bruno has a mass of 100 kg. they stand on a slippery surface and push off eachother. bruno has an acceleration of 1.0 m/s squared. what is nina's acceleration?
Forces occur in pairs, equal and opposite (Newtons third law)
40*a=-(100)(1)
solve for a. Notice it is negative, meaning the opposite direction from the donkey.