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Can a particle accelerate if its speed i...

Can a particle accelerate if its speed is costant ? Can it acckerate if its velcity is constant ? Explain.

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When the particle describes a uniform circular motion, its speed is constant, but it has centripetal acceleration acting along the radius directed towards the centre of the circular path.
When the particle is moving with a constant velocity, there is no change in velocity with time and hence its acceleration is zero.
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Assertion : The equation of motion can be applied only if acceleration is along the direction of velocity and is constant. Reason : If the acceleration of a body is constant then its motion is known as uniform motion.