A 50-kg boy stands on a 2.26-kg skateboard. They are at rest. If the boy steps off the front of the board at a speed of 0.5 m/s, at what speed will the skateboard move backwards without him?

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explanation:

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2