Physics - W.E.P. Question with Solution | TestHub

In uniform circular motion, the speed of the particle remains constant.

Velocity is a vector quantity. Although its magnitude (speed) is constant, its direction changes continuously along the tangent to the circular path. Hence, velocity is not constant.

Acceleration in uniform circular motion is centripetal, directed towards the centre. Its magnitude is constant ($v^2/r$), but its direction changes continuously. Hence, acceleration is not constant.

Displacement is a vector quantity that changes as the position of the particle changes.

Kinetic energy is a scalar quantity given by $K=\frac{1}{2}m{v}^2$. Since both mass $m$ and speed $v$ are constant, the kinetic energy remains constant.

Answer: kinetic energy.