Q3 of 53 Page 201

Which of the two can be zero under certain conditions: average speed of a moving body or average velocity of a moving body?

Average speed is a scalar quantity and hence it cannot be zero but average velocity is a vector quantity and it can be zero if the object is moving in a circular path.


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1

Define average speed, write any one point of difference between average speed and average velocity.

 2

The maximum speed of a train is 80 km/h. It takes 10 h to cover a distance of 400 km. Find the ratio of its maximum speed to its average speed.

 4

(i) Give two factors on which acceleration depends.

(ii)Mention the formula and SI unit of acceleration.

 5

Fill in the blanks.

(i) ………..is the term used for negative acceleration.


(ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is …………….. .