Question

1. what is the average velocity of a bike that travels 210 m e and then travels 300 m w in 30 s? 3 marks ti
2. the area under a velocity - time graph always represents

a. change in acceleration
b. acceleration
c. change in velocity
d. displacement
e. distance

1. the position - time graph that represents \uniform motion\ is

a. a
b. b
c. c
d. d
e. e

Explanation:

Step1: Recall average - velocity formula

The formula for average velocity is $v_{avg}=\frac{\Delta x}{\Delta t}$, where $\Delta x$ is the total displacement and $\Delta t$ is the total time.

Step2: Calculate total displacement

The bike travels $210\ m$ and then $300\ m$, so the total displacement $\Delta x = 210 + 300=510\ m$.

Step3: Identify total time

The total time $\Delta t = 30\ s$.

Step4: Calculate average velocity

$v_{avg}=\frac{510}{30}=17\ m/s$.

Answer:

$17\ m/s$