JEE PHYSICS MCQ: MOTION IN PLANE

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Which of the following statements are correct ?
I. Centripetal acceleration is always directed towards the centre.
II. Magnitude of the centripetal acceleration is

\frac{{{v^2}}}{R}

.
III. Direction of centripetal acceleration changes pointing always towards the centre.

View answer and explanation

Correct option: D

I, II and III

Option D (I, II and III) is correct because all three statements about centripetal acceleration are accurate.

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\mathrm{\vec A}\,and\,\mathrm{\vec B}

is Assertion: The necessary condition for motion in two dimensions, velocity and acceleration vectors should have any angle between

0^{\circ}

and

90^{\circ}

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\mathrm{If}\,(\mathbf{a}+3 \mathbf{b}) \cdot(7 \mathbf{a}-5 \mathbf{b})=0

and

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. Then, the angle between

\mathbf{a}

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\mathbf{b}

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\theta

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\left(90^{\circ}-\theta\right)

with the horizontal direction from the same point with velocity

39.2 \mathrm{~ms}^{-1}

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