Question

A student ties a ball at the end of a string and whirls the string at a constant speed. If the radius of the circle along which the ball moves is 1.2 m and the acceleration is 7.5 m/s2what is the speed of the ball?

Answer 1

a = v ² / R

where a is acceleration, v is speed, and R is the radius. So

7.5 m/s² = v ² / (1.2 m)

v ² = (7.5 m/s²) / (1.2 m)

v ≈ 6.8 m/s