Practice question
Question
A rocket accelerates from rest at 4m/s2 for 6s, then moves at constant speed for 5s. What is the total distance covered?
Explanation
Phase 1: v=4⋅6=24m/s, x1=12⋅4⋅(6)2=72m. 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 192 m as the result, so option D is correct.