Molly leaves a history classroom and walks 29 meters north to a drinking fountain. Then she turns and walks 14 meters south to an art classroom. What is the Molly's total displacement from the history classroom to the art classroom?
30
Question 7
7.
A car is traveling West on Old Milton Parkway at 100 km/hr when the driver spots a police cruiser in the bushes. The driver hits the brakes and the velocity of the car is reduced to 80 km/hr. How would you describe the acceleration of the car and driver? (Assume east is the positive direction).
The car experienced negative acceleration with velocity in the positive direction.
The car experienced positive accelerationwith velocity in the negative direction
The car had negative acceleration with velocity in the positive direction
The car had positive acceleration with velocity in the negative direction
A rocket must be moving at least 11.2 km/s to break earth’s gravity. If a rocket starts from rest on the launchpad, what would best describe the motion it needs in order to reach orbit? (Space is 2000km from the surface of the planet).
The rocket will need to decelerate rapidly
The rocket would have to have constant velocity for the entire trip.
The rocket must make the trip in at least 5 minutes
The rocket must accelerate until it is traveling 11.2 km/s, in at least 2000km.
A person runs 3 km north. One hour later, she runs 3 km south. Which of the following statements describes the person’s complete trip? (select all that apply)
The distance traveled is greater than the displacement.
The displacement is 6 km.
The distance traveled is 6 km.
The displacement is greater than the distance traveled.
Compare and contrast average speed with average velocity
Average speed is always less than average velocity.
Average speed is a vector quantity, but average velocity is a scalar quantity
Average speed has only magnitude, but average velocity has both magnitude and direction.
Average speed has units of mph and average velocity has units of m/s.
