A car has to come to a quick stop at a red light. In doing so it accelerates at a constant rate of -50 m/s2. If the car has a mass of 2200 kg, what is the force needed to stop the car?

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity