# Calculating Velocity from a Position-Time Graph| University Physics

## Solution:

### Part A

The slope of the line from 0 to 20 is the constant velocity

$\displaystyle v=\frac{50-25}{20-0}=\frac{25}{20}=1.3\:m/s$

### Part B

The line is horizontal at this instant.

$\displaystyle v=0$

### Part C

$\displaystyle v=\frac{0-50}{40-30}=\frac{-50}{10}=-5\:m/s$