An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 m s2?.

Solution:Mass of the automobile vehicle, m= 1500 kg
Final velocity, v= 0 (finally the automobile stops)
Acceleration of the automobile, a= ˆ’1.7 msˆ’2
From Newton€™s second law of motion:
Force = Mass x Acceleration = 1500 x (ˆ’1.7) = ˆ’2550 N
Hence, the force between the automobile and the road is ˆ’2550 N, in the direction opposite to the motion of the automobile.