Practice Problems in Projectile Motion
1. Consider these diagrams in answering the following questions.
Which diagram (if any) might represent ...
a. The initial horizontal velocity?
b. The initial vertical velocity?
c. The horizontal acceleration?
d. The vertical acceleration?
2. Supposing a snowmobile is equipped with a flare launcher which is capable of
launching a sphere vertically (relative to the snowmobile). If the snowmobile is in
motion and launches the flare and maintains a constant horizontal velocity after the
launch, then where will the flare land (neglect air resistance)?
a. in front of the snowmobile
b. behind the snowmobile
c. in the snowmobile
3. Suppose an airplane drops a flare while it is moving with a constant horizontal
speed at an elevated height. Assuming that air resistance is negligible, where will the
flare land relative to the plane?
a. directly below the plane
b. below the plane and ahead of it
c. below the plane and behind it.
Note: # 4 and 5 are diagrammed at the end of the sheets
4. Anna Litical drops a ball from rest from the top of 80-meter high cliff. How much
time will it take for the ball to reach the ground and at what height will the ball be
after each second of motion?
5. A cannonball is launched horizontally from the top of an 80-meter high cliff. How
much time will it take for the ball to reach the ground and at what height will the ball
be after each second of travel?
6. Fill in the table below indicating the value of the horizontal and vertical
components of velocity and acceleration for a projectile.
7. The diagram below shows the trajectory for a projectile launched non-horizontally
from an elevated position on top of a cliff. The initial horizontal and vertical
components of the velocity are 8 m/s and 20 m/s as shown in the diagram. Positions
of the object at 1-second intervals are shown. determine the horizontal and vertical
velocities at each instant shown in the diagram.
8. A tennis ball is kicked horizontally off a 35.0-meter high hill and lands a distance
of 40.0 meters from the edge of the hill. Determine the initial horizontal velocity of
the tennis ball.
9. A basketball player leaves the ground with an initial velocity of 10 m/s at an angle
of 30-degrees above the horizontal. Determine the time of flight, the horizontal
distance, and the peak height of the basketball player.
The following diagram pertains to questions #4 and #5 above. A scale is used where
1 cm= 5 meters. (Note that 1-cm may be a different distance for different computer
monitors; thus, a cm-ruler is given in the diagram.)