Chapter 9, Problem 36P

A 0.25 kg puck is initially stationary on an ice surface with negligible friction. At time t = 0, a horizontal force begins to move the puck. The force is given by $\stackrel{\to }{F}$ = (12.0 − 3.00t²) $\hat{i}$, with $\stackrel{\to }{F}$ in newtons and t in seconds, and it acts until its magnitude is zero, (a) What is the magnitude of the impulse on the puck from the force between t = 0.500 s and t = 1.25 s? (b) What is the change in momentum of the puck between t = 0 and the instant at which F = 0?