Question

Step 1

(a)

Newton's second law states that acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. If the acceleration of an object is zero, then the net force acting on it will be zero. Acceleration is the rate of change of velocity of an objcet. If the velocity of an object is constant, then the object will be having zero acceleration. Velocity is also a vector which has both magnitude and direction. This implies the acceleration will have a non zero value , either when the speed of the object changes or when its direction of motion changes. Here the car is moving with constant speed to the right. Neither the magnitude nor the direction of velocity changes so that the net acceleration and hence the total force on the car is zero.

Step 2

(b)

The car is moving with constant speed to the left. Neither the magnitude nor the direction of velocity ...

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