Question

A car is moving with a constant speed of $50km \cdot {h^{ - 1}}$ , which of the following statements is correct?
A. The acceleration of a car is definitely zero.
B. The car has an acceleration only if it is moving along a curved path.
C. The car may have acceleration even if it is moving along a straight path.
D. The car may not have an acceleration even if it is moving along a curved path.

Answer 1

A constant velocity requires an object to move at a constant speed in a constant direction. Constant direction forces the thing to move in a straight line. As a result, constant velocity refers to motion in a straight line with a constant speed.

Complete answer:
The rate at which velocity changes over time is denoted as acceleration. Acceleration and velocity are both vector quantities, which means they have both magnitude and directions.The car maintains a constant pace. As a result, the magnitude of velocity is constant. A change in direction is required for the car to accelerate. As a result, only when travelling along a curved road does the car experience acceleration.

Hence, the correct option is B.

Note: It should be underlined that students should not be confused by the phrase's acceleration and velocity. Acceleration is the rate of change of velocity, whereas velocity is the rate of change of location with respect to time. Both are vector numbers (and hence have a specified direction), but velocity is measured in metres per second, whereas acceleration is measured in metres per second squared.