Question

A particle moves along a horizontal circle with constant speed. If 'a' is its acceleration and 'E' is its kinetic energy
A) a is constant B) E is constant C) a is variable D) E is variable

Moderate

Solution

Speed (u) is constant
.: E = 1/2 m u² = constant
Again 'a' is always directed towards the centre of the circular path. As the particle changes its position ,direction of 'a' also changes. Therefore Option-(4) is correct.

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