Question

Define acceleration and state it's SI unit . For motion along a straight line ,when do we consider the acceleration to be (i)positive (ii) negative ? Give an example of a body in uniform acceleration

Answer 1

Explanation:

Acceleration is defined as the rate of change in velocity. For motion along a straight line, if the velocity of the body is increasing with time, then it is said to be in positive acceleration. While, if the velocity of the body is decreasing with time, then it is said to be in negative acceleration or retardation.