Question

In a uniform circular motion (horizontal) of a ball tied with a string, velocity at any time is at an angle, $\theta$, with acceleration. Then $\theta$ is:

• A. ${60}^0$
• B. ${30}^0$
• C. ${90}^0$
• D. none of the above

Answer 1

Answer: (C)

${90}^0$

In a uniform circular motion, acceleration is always towards center and velocity is along the tangent. So, $\theta ={90}^{\circ }$.