Two cars collide with each other. before the collision, one car (m = 1100 kg) is going north at 18 m/s and the other car (m = 1300 kg) is going south at 16 m/s. what is the momentum of the system made up of the two cars after the collision?

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.

If you put a helium-filled balloon in the refrigerator, what will happen?

If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?