Question

# A particle is moving along a curve . Then

A
if its speed is constant, it has no acceleration
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B
if its speed is increasing, the acceleration of the particle is along its direction of motion
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C
The direction of its acceleration cannot be along the tangent.
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D
None of these
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Solution

## The correct option is C The direction of its acceleration cannot be along the tangent.(i) In accelerating body, →v changes. (ii)→a=→at+−→aR (iii)Radial acceleration, aR can never be zero →a=→at+−→aR Even if the motion is not circular, there is some acceleration which changes this direction of velocity, and this acceleration is not along the curve.

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