Q140
General SciencePhysics
A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration of the particle is
- a.Zero
- b.V/r
- c.V/r²
- d.$V^2/r$
Answer: (D) $V^2/r$
For uniform circular motion, the centripetal acceleration is directed toward the centre and has magnitude $a = \frac{v^2}{r}$, where $v$ is the speed and $r$ is the radius. Although the speed is constant, the direction changes continuously, so the particle is always accelerating. This acceleration is not zero.