Practice question
Question
A person walks 8m in 2s and then walks back 4m in 1s. What is the average speed?
Explanation
Average speed = total distance / total time. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 4 m/s as the result, so option C is correct.