The field is 78 meters long. A timer started when the sled started at the top of the hill. When the sled is at the bottom of the hill and the beginning of
the field the timer was at 4 seconds. When the sled is at the end of the field the
timer was at 16 seconds. What is the sled's velocity as it crosses the field? *

4

Explanation: when you're solving velocity you should divide the two numbers so 16/4=4

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.