Two buses have equal masses (5,000 kg). Bus A is moving at a velocity of 20 m/s west. Bus B is at rest. When they collide, Bus B bounces off of Bus A. After they collide, Bus A has 0 momentum. What is the final momentum of Bus B?

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

The energy equivalent of the rest mass of an electron is