Q21. A stone tied to the end of a string 80cm long is whirled in a horizontal circle with a constant speed. If the same stone makes 14 evolutions in 25 sec, what is the magnitude of the acceleration of the stone?Physics — Circular Motion and Momentum — Question 21 of 121A. 680 cm/s2B. 860 cm/s2C. 720 cm/s2D. 990 cm/s2Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →