Question

A 250-kg snowmobile is traveling north at 12 m/s.Suppose that 15 s later it is going south at 18 m/s what is the acceleration

Answer 1

 From what I think, we first find the relative speed, which is the difference in speeds from both directions, being 18-12= 6 m/s. then acceleration is given by speed/time or 6/15=2/5 or 0.4 m/s^2. \ b.Momentum is given by mass*velocity and that could be 250*3= 750Kgms^-1