Question

A car is moving at a constant speed of 70 km/h. Which of the following statements is correct?

• A. The acceleration of the car is definitely zero.
• B. The car has an acceleration only if it is moving along a curved path
• C. The car may have an 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

The correct option is B

The car has an acceleration only if it is moving along a curved path

1. Acceleration is defined as the rate of change in velocity,
2. So if the car is moving at a constant speed that means the rate of change in magnitude of velocity is zero.
3. But direction of body can be change and hence velocity can also be change as it is vector quantity .
4. Hence, if body moving in circular path , its direction is constantly changing, so it has some acceleration.

Hence, Option B is correct

The car has an acceleration only if it is moving along a curved path.