A rocket accelerates uniformly from rest at 8m/s2 until it reaches a speed of 40m/s, then maintains that speed for 5s. W
Phase 1 (acceleration): v=v0+at, 40=0+8t⇒t=5s. 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 300 m as the result, so option A is correct.
Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Kinematic Equations and Uniformly Accelerated Motion