Q. Which of the following is/are correctly matched?

1. Speed- scalar
2. Velocity- vector
3. Acceleration- vector

Select the correct answer from the codes given below:
Answer: Only 1 and 2
Notes: Speed is distance covered per unit time. It is a scalar quantity. Velocity is the speed of an object moving in a definite direction. The velocity of an object can be uniform or variable. It can be changed by changing the object's speed, direction of motion or both. Therefore, it is a vector quantity. Acceleration is change in velocity per unit time. Its has both magnitude and direction. Therefore, it is a scalar quantity.

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