Roger decided to ignore the warning and shoot an arrow straight up into the air. If the arrow leaves the bow with initial velocity of 18.5m/s, how long will it have been in the air when it comes to rest briefly before it starts to plummet back to the earth?

Sound is a disturbance that travels through a medium as a

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?