1.

A stone tied to the end of string 80cm long is whirled in horizontal circle with a constant speed. If the stone makes 14 revolutions in 25 sec, what is the magnitude of acceleration of the stone?

A. 680 cm/s<sup>2</sup>
B. 860 cm/s<sup>2</sup>
C. 720 cm/s<sup>2</sup>
D. 990 cm/s<sup>2</sup>
Answer» E.


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