A runner decreases his velocity from 20m/s to 10m/s in 2.0 s. What was his average acceleration? a 6.3m/s^2 b 8.0m/s^2 C 3.2m/s^2 d -5.0m/s^2

Question

Answer 1

## Step1: Identify Initial and Final Velocities### The initial velocity

is

and the final velocity

is

.## Step2: Identify Time Interval### The time interval

during which the change in velocity occurs is

.## Step3: Use the Average Acceleration Formula### The formula for average acceleration

is given by:

## Step4: Substitute the Values### Substituting the given values into the formula:

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