Projectile Motion Review!

A projectile is launched with an initial vertical velocity of 60 m/s. How long will it take to reach its highest point?

Assume the acceleration is 10 m/s^2. The object loses 10 m/s every second on its way to the top.

• 4 seconds

• 6 seconds

• 8 seconds

• 10 seconds

At which of the following places does a projectile have the 0 vertical velocity?

• At the top of its path

• Half way to the top

• At the instant it is launched

• All points have the same velocity

At which of the following places does a projectile have the greatest acceleration?

• At the peak of its trajectory

• Half way to the peak

• At the instant it is launched

• All points have the same acceleration

In the absence of air friction, the vertical velocity doesn't change as the projectile moves.

• True

• False

• Sometimes true

• Sometimes false

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

The more mass an object has, the faster it will fall.

• True
• False

If a projectile reaches its peak in 1.2 seconds, what is the maximum height it reaches?

• 3 m

• 3.6 m

• 6 m

• 7.2 m

Suppose Lemming A runs off the edge of the cliff at 2 m/s and Lemming B runs off the edge at 1 m/s. Lemming B has twice the mass as Lemming A. Which will hit the ground first?

• A

• B

• Both at the same time

An object is thrown up and to the right. It lands 120 meters away in 4 seconds. What is the horizontal velocity?

• 480 m/s

• 30 m/s

• 80 m/s

An object is thrown up and to the right with an initial velocity. What is true about the horizontal and vertical speed?

• The horizontal speed is constant; the vertical speed is changing.

• The horizontal and vertical speed are changing.

• Only the horizontal speed is changing