A ball is thrown upward with a velocity of Vi. The ball reaches a height of 39 meters. Determine the initial velocity of the ball and the time of the entire trip.

What is a difference between the magnetic fields of a regular bar magnet and an electromagnet? A. A bar magnet's field is temporary, but an electromagnet's is permanent. B. A bar magnet's field is permanent, but an electromagnet's is temporary. C.

A 4kg object is moving at a speed of 5 m/sec. how much kinetic energy does the objects have

If an airplane undergoes a displace- ment of 500. km northwest in 1.2 hr, what is its average velocity?

An acorn falls from a tree. How fast is the acorn moving after 1.2 seconds? A. 9.8 m/s B. 1.2 m/s C. 8.2 m/s D. 11.8 m/s

If the same net force is applied to a 7 kg object and a 21 kg object, then the 21 kg object accelerates three times faster than the 7 kg object. the 7 kg object accelerates three times faster than the 21 kg object.

Niko was hiking in the mountains when he found a spring, or a place where water naturally flows out of the ground. Where did the water in the spring come from? A. It is water that was squeezed out of an igneous rock when the rock changed. B.

Is mount st. Helen still active today

When a pendulum swings if not continuously pushed it will stop eventually because some of its energy is changef into what energy

How does a car's kinetic energy change when it speeds up from 10 to 20 m/s? a. It quadruples. b. It stays the same. c. It doubles. d. It triples.

A boulder on the mythical planet mongo drops off a cliff and falls from rest 1000 m in 10.0 s. (A) what's the initial speed of the Boulder? (B) determine the acceleration due to gravity on mongo. Ignore friction.