A 1200 kg car traveling east at 10 m/s, strikes a mailbox and receives an impulse that has a magnitude of 8000 N•s. What is the car’s velocity after this impact?

If the impact happened over 0.5 s, what was the magnitude of the impact force?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.