A 900 kg vehicle is accelerating at 15 m/s2. a) What is the net force acting on the vehicle?
b) What is the drag force acting on the vehicle if the applied force from the engine is 14000 N?

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.

cant without the picture! ?