A 2 kg body is initially moving at 4 m/s. A machine supplies constant net power of 12 W for 3 s. If final kinetic energy is N joule, find N.
Physics · Work , Power and Energy · Power
JEE Mains NEET JEE Advanced

Question

A 2 kg body is initially moving at 4 m/s. A machine supplies constant net power of 12 W for 3 s. If final kinetic energy is N joule, find N.

G1 Physics · Accepted Answer

Initial K=½×2×4²=16 J. Energy supplied = Pt=12×3=36 J. Final K=16+36=52 J.