A car starts from rest and moves along the path OAB as shown. It moves with a speed of 35 miles per hour along OA and 50 miles per hour along AB
which is true for the motion of the car during its journey along OAB?
A. The velocity of the car remains constant throughout the journey
B. The change is speed alone caused the velocity of the car to vary
C. The change in direction alone causes the velocity of the car to vary
D. The velocity of the car changes due to the change in speed and direction
D. The velocity of the car changes due to the change in speed and direction.
Since the car is moving at different speeds along OA and AB, its velocity is changing. Additionally, the car is changing its direction at point A, which also causes the velocity to vary. Therefore, both the change in speed and direction result in a change in velocity for the car.