Question

A truck of 2945kg has a velocity of 8.30 m/s and comes to a stop in 15.0 s. Find its final momentum. 

Answer 1

The initial momentum

$$p_i=mv_i\\ =\rm 2945\: kg*8.30\: m/s=24443\: kg\cdot m/s$$

The final momentum

$$p_f=mv_f=0\rm\: kg\cdot m/s$$