Practice question
Question
A car decelerates uniformly from 18m/s to rest over a distance of 36m. What is the deceleration?
Explanation
Use v2=v02+2ax. Here, v=0, v0=18m/s, x=36m. 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 36 m/s² as the result, so option A is correct.