A uniform solid ball rolls smoothly along a floor, then up a ramp inclined at 15.2 o. It momentarily stops when it has rolled 2.00 m along the ramp. What was its initial speed?

Explanation:

Let assume that ball's motion is frictionless and its geometric dimensions can be neglected. Besides, it is assumed that ball begins at a height of zero. The ball can be modelled by means of the Principle of Energy Conservation:

The initial speed of the ball is:

6 cos 34, 6 sin 34 trig

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.