Projectile Quiz

If you decrease the height you launch an object, the time the object will be in the air will ​ (a)  

• decrease

• increase

• remain constant

Answer explanation

Decreasing the launch height of an object will decrease the time it stays in the air.

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. Which will hit the ground first?

• A

• B

• Both at the same time

What assumptions can you make on the initial vertical velocity (Vy) of the 2 cannon balls as shown in the image?

• Initial vertical velocity of both cannon ball is greater than 0 m/s.

• Initial vertical velocity of both cannon ball is equal to 0 m/s.

• Initial vertical velocity of A is 0 m/s while B has a velocity greater than 0 m/s.

• Initial vertical velocity of A is 0 m/s while B has a velocity less than 0 m/s.

Which statement is true about the velocity of the 2 cannon balls?

• Horizontal velocity is constant.

• Vertical velocity is constant.

• Horizontal and vertical velocity changes.

• Horizontal velocity increases while vertical velocity decreases.

The range of the projectile is ....

• The distance from the point of release to the point where the object landed.

• The speed of the projectiles

• The velocity of the projectiles

• The time covered by the projectile during its entire motion.

In the absence of air resistance, why does the horizontal component of velocity for a projectile remain constant while the vertical component changes?

• No horizontal acceleration

• Constant horizontal acceleration

• No vertical acceleration

• Horizontal velocity is always 0

Answer explanation

No acceleration means the velocity does not change. A constant acceleration means the velocity is changing by the same amount each second.

A marble traveling at 3 m/s rolls off the edge of a 1 m high table. What is its initial vertical speed?

• -10 m/s

• 0 m/s

• -3 m/s

• -15 m/s

What is the height of a horizontal projectile if it takes 3 seconds to hit the ground?

• 3.00 m
• 29.4 m
• 44.1 m
• 88.3 m

If you throw a baseball straight up, what is it's velocity at the highest point?

• -9.8 m/s²

• -9.8 m/s

• 0 m/s²

• 0 m/s

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

• True
• False