Projectile Practice

Multiple Choice

If a projectile is launched with an initial velocity of 50 m/s at an angle of 45 degrees, what is the time of flight?

• 5.1 s

• 7.2 s

• 10.2 s

• 12.5 s

Multiple Choice

Which diagram shows the forces acting on Peter when he is falling at Terminal Velocity?

• 1

• 2

• 3

Multiple Select

Velocity and acceleration are both vectors; they have a direction. What is the direction of the velocity and acceleration vectors of a tennis ball that is falling downward from its highest point towards the ground? Pick two answers.

• The velocity vector is directed upward.

• The velocity vector is directed downward.

• The acceleration vector is directed upward.

• The acceleration vector is directed downward.

Open Ended

Observe the diagram. The blue ball is rolled quickly across the table and allowed to fall off the edge while the purple ball falls straight down. If they both have the same mass and leave the edge of the table at the same time, which ball will hit the ground first? Explain your reasoning in terms of vertical and horizontal motion.

Open Ended

How does the video clip justify that horizontal motion of a projectile is independent of its vertical motion?

Multiple Choice

An object is launched horizontally from a height of 20 m above the ground with speed 15 m/s. Determine: a. the time at which it will hit the ground. b. the horizontal distance travelled. c. the speed with which it hits the ground.

• the time it will hit the ground

• the horizontal distance travelled

• the speed with which it hits the ground

• none of the above

Open Ended

Determine the maximum height reached by a projectile launched at 32.0° to the horizontal with an initial speed of 25.0 m/s.

Multiple Choice

A projectile is launched at 68.0° above the horizontal and at a speed of 55 m/s. What is the maximum height reached by the projectile?

• 233 m

• 158 m

• 2.6 m

• 133 m

Open Ended

Derive an equation for the terminal velocity.

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident