John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second. If north is the positive direction, what are John and Betty's speeds?

Radioactivity is a tendency for an element or a material to

A boulder with a weight of 780 N is resting at the edge of a cliff that rises 123 m above the ground. What is the gravitational potential energy of the boulder?

What is the energy equivalent of an object with a mass of 1.83 kg?

A passenger on a bus moving east sees a man standing on a curb. from the passenger's perspective, the man appears to

Q) Suppose, you are in a sporting event. You notice that everyone stands up when it's his turn, creating a wave that moves through the crowd and they sit back down again after a while.

Through which medium would EM waves travel the fastest? A. The Ocean B. The Atmosphere C. Rocks

Average mass of a toy car (small, hot wheels) ?

A cannon directed straight upward launches a ball with an initial speed v. The ball reaches a maximum height h in a time t. Then, the same cannon is used to launch a second ball straight upward at a speed 2v.

Does the sun fuse hydrogen into helium or vice versa?

Is it possible to put a distance versus time graph to be universal go mine