Centripetal Acceleration

Question

Here is my question:

You are whirling a ball attached to a string such that you describe a circle of radius $75$ cm, at a velocity of $1.50$ m/s. What is the acceleration of the ball?

Could you show an equation to solve it?

My idea:

$$F_{\text{centripetal}} = \frac {v^2}{r}m$$

Regards!

Answer 1

$$F=ma=\frac{mv^2}{r}$$ $$a=\frac{v^2}{r}$$

Answer 2

The centripetal acceleration is give by

$$a=\frac{v^2}{r}$$