While standing at the top of a 200 m cliff, you throw a rock downward at 4 m/s. What is its speed when it hits the ground?

2v0/g.

Explanation:

while at the same time throws a second rock vertically downward at the same speed. How long after the rock thrown downward hits the ground does the rock thrown upwards hit?

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 heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.