A particle is moving in a circular path of radius r. The displacement after a circle would be:

A. 0

B. pr

C. 2r

D. 2pr

A train travels the first 20 km at a uniform speed of 40 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.

A car is moving along a straight road at a steady speed. It travels 200 m in 5 seconds :

(a) What is its average speed?

(b) How far does it travel in 1 second?

(c) How far does it travel in 6 seconds?

(d) How long does it take to travel 240 m?

The numerical ratio of displacement to distance for a moving object is :

A. < 1

B. = 1 or > 1

C. > 1

D. = 1 or < 1

A boy is sitting on a merry-go-round which is moving with a constant speed of 20 ms^-1. This means that the boy is :

A. at rest

B. moving with no acceleration

C. in accelerated motion

D. moving with uniform velocity