# Calculating the acceleration of a rolling ball

## What is the acceleration of the ball as it rolls across the grass?

## Answer: -2.24 m/s²

## Explanation:

**Given:**

Initial velocity (v₀) = 20 mi/hr = 8.94 m/s

Final velocity (v) = 0 m/s

Time (t) = 4.0 s

**Find:** Acceleration (a)

Using the kinematic equation:

**v** = **v₀** + **a**t

0 m/s = 8.94 m/s + a (4.0 s)

**a** = -2.24 m/s²

Therefore, the acceleration of the ball as it rolls across the grass is **-2.24 m/s²**.