A4350 kg truck, driving 7.39 m/s, runs into the back of a stationary car. after the collision, the truck moves 4.55 m/s and the car moves 11.5 m/s, both in the same direction. what is the mass of the car?

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.