Practice question
Question
A car accelerates uniformly from rest at 3m/s2 for 7s. What is the final velocity?
Explanation
Use the equation v=v0+at. 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 21 m/s as the result, so option A is correct.