4. The magnitude of the net force exerted in the x direction on a 4.00-kg particle varies in time as shown in the figure below. F (N) A 20 15 10 5 + 10 20 30 40 t (s) (a) Find the impulse of the force over the 40.0-s time interval. (b) Find the final velocity the particle attains if it is originally at rest. (c) Find the average force exerted on the particle for the time interval between 0 and 40.0 s.

4. The magnitude of the net force exerted in the x direction on a 4.00-kg particle varies in time as shown in the figure below. F (N) A 20 15 10 5 + 10 20 30 40 t (s) (a) Find the impulse of the force over the 40.0-s time interval. (b) Find the final velocity the particle attains if it is originally at rest. (c) Find the average force exerted on the particle for the time interval between 0 and 40.0 s.