G9_Q1

An object is dropped from rest and falls freely 20 meters to Earth. When is the speed of the object 9.8 meters per second?

• during the entire first second of its fall

• at the end of its first second of fall.

• during its entire time of fall

• after it had fallen 9.8 meters

A ping pong ball is dropped from the top of the building. A second ping pong ball is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the ping pong balls.

• The first ping pong ball accelerates faster.

• The second ping pong ball accelerates faster.

• The two ping pong balls accelerate at the same rate.

• It is impossible to determine from the information given.

To describe this car’s motion, a student should use its _____.

• direction and speed

• mass and volume

• speed and color

• volume and direction

A dragster and a train both start from rest and accelerate at the same rate. However, the dragster accelerates for twice the amount of time as the train. What is the travelled distance of the dragster compared to the train?

• Half as much

• The same

• Twice as much

• Four times as much

A a hockey puck, football, and a tennis ball all fall down in the absence of air resistance. Which of the following is true about their acceleration?

• The acceleration of the football is greater than the other two

• The acceleration of the hockey puck is greater than the other two

• The acceleration of the tennis ball is greater than the other two

• They all fall down with the same constant acceleration

The motion of an object with constant acceleration is also known as ______.

• circular motion

• uniform motion

• constant motion

• uniformly accelerated motion

The diagram below presents the position and elapsed time of a motorbike that starts from rest and accelerates at a constant rate. Use it to answer the next two questions. What is the average velocity of the motorbike during first 5 s?

• 0 m/s

• 5 m/s

• 10 m/s

• 15 m/s

The diagram below presents the position and elapsed time of a motorbike that starts from rest and accelerates at a constant rate. Use it to answer the next two questions. What is the acceleration of the motorbike?

• 0 m/s^2

• 2 m/s^2

• 4 m/s^2

• 6 m/s^2

Russian gymnast Dina Averina starts her show by tossing a ball in the air with an initial velocity of 19.6 m/s. How long is the ball in the air? (Include units for final answer: ex. "m", "m/s", "s", "m/s^2" )

(a)  

Russian gymnast Dina Averina starts her show by tossing a ball in the air with an initial velocity of 19.6 m/s. How far vertically upward did the ball travel? (Include units for final answer: ex. "m", "m/s", "s", "m/s^2" )

(a)