Q1. Find the change in momentum of a 1080 {rm kg} car that increases its speed from 5.0 {rm m/s} to 14.5 {rm m/s} in a time of 11 {rm s} while travelling in the same direction?

Q2. A 24.0- packing case is initially at rest on the floor of a 1610- pickup truck. The coefficient of static friction between the case and the truck floor is 0.20, and the coefficient of kinetic friction is 0.2. Before each acceleration given below, truck is travelling due north at constant speed. What is the magnitude of the frictional force acting on the case as the truck accelerates at 2.43 m/sec^2.