When a body moves at constant speed around a circle, which statement is correct?

Question

G1 Physics · Accepted Answer

Step 1 — Principle: In uniform circular motion, centripetal force is perpendicular to the instantaneous velocity. Step 2 — Working: The centripetal force is always perpendicular to instantaneous displacement, so its work is zero. Step 3 — Working: K=½mv² remains constant even though velocity direction and acceleration change. Correct answer: A — No net work is done on it.