Velocity vs. Time Graphs

8.) From 9 to 12 seconds the average velocity of the person was ...

• 1 m/s

• -1 m/s

• 3 m/s

• -3 m/s

Answer explanation

xf-xi= (-8)-(-5)=-3m,

tf-ti= (12-9) = 3sec

so -3/3 = -1 m/s

From 5 to 6 seconds the average velocity of the person was ...

• 1 m/s

• -1 m/s

• 3 m/s

• -3 m/s

• 0 m/s

Answer explanation

xf-xi= (25)-(25)=0m,

They did not move, so they are at rest

From 0 to 2 seconds the position of the person was located at .

• 2 m

• 10 m

• 5 m

• 0 m

Between 9 to 12 seconds the person's average velocity has a negative value. Why? What does that mean? Check all that apply

• They were moving away from their original position

• they are moving to the left

• They are moving to the right

• They are moving back towards home

• They are going so fast that time is moving backwards!! Wow!!

How many times does the object change the direction is it going in, based on this graph?

• 0

• 1

• 2

• 3

Between which time intervals does the object speed up/increase velocity?(velocity moves away from 0 m/s point)

• 0-10 sec and 40-55 sec

• 15-30 sec and 40-55 sec

• 0-10 sec and 30-40 sec

• 15-30 sec and 30-40 sec

What is the speed of an object that travels 60 meters in 4 seconds?

• 240 m/s
• 15 m/s
• 0.067 m/s
• 15 mph

Which runner stopped for a rest?

• Albert

• Bob

• Charlie

• None of them stopped

How fast did the object move away from the starting point between 0 sec and 4 sec?

• 0.5 meters every second

• 0.5 meters

• 4 meters every second

• 4 meters

• 2 meters every second

A runner races in the 100 meter dash.  It takes her 10 seconds to finish.  What is her average speed?

• 10 m/s
• 1000 m/s
• 100 seconds
• 10 seconds