Projectile Review

The horizontal component of a projectile's velocity is independent of...

• it's range
• time
• the vertical component
• none of these

In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves. 

• True
• False
• Sometimes true
• Sometimes false

In the absence of air resistance, the angle at which a thrown ball will go the farthest is

• 15^o
• 30⁰
• 45^o
• 60⁰

At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. Which ball hits the ground first? 

• Neither- they hit at the same time
• the horizontally thrown ball
• the dropped ball
• None of these

A bullet is fired horizontally at a height of 1.3 meters at a velocity of 950 m/s. Assume no air resistance. How far did the bullet travel horizontally when it hit the ground?

• 252.04 m
• 489.32 m
• 126.02 m
• 346.00 m

Which of the following would NOT be considered a projectile? 

• a cannonball thrown straight up
• a cannon ball rolling down a slope
• a cannonball rolling off a table
• a cannonball thrown in the air

In the diagram, which letter represents the vertical displacement  $\overrightarrow{d}_y$  ?

• A

• B

• C

• D

In the diagram, which letter represents the horizontal displacement $\overrightarrow{d}_x$ ?

• A

• B

• C

• D

A ball rolls off a table top and strikes the floor as shown. Given the measurements made, the time the projectile spent in the air is ---.

• 17 s

• 0.34 s

• 0.58 s

• 0.49 s

A skateboarder rolls off a bridge into the river as shown. If the skateboarder spent 0.79 s in the air, how far above the river is the edge of the bridge?

• 5.5 m

• 0.70 m

• 1.3 m

• 3.1 m

• Not enough information given.