The table below shows the distance in cm, travelled by the objects A, B and C during each second. (i) Which object is moving with constant speed ?
Give a reason for your answer.
(ii) Which object is moving with a constant acceleration? Give a reason.
(iii) Which object is moving with irregular acceleration?

Explanation

(i) The object A is moving with constant speed. The reason is that it covers equal distance (= 20 cm) in each second.
(ii) The object C is moving with a constant acceleration. The reason is that for the object C, the distance covered in each second (i.e., velocity) increases by the same amount (= 40 m `s^(-1)`) in each interval of one second. (iii) The object B is moving with irregular acceleration. The reason is that the change in velocity is not same in each interval of one second.