Projectile Motion 1

A projectile is launched through the air. When the object reaches its maximum height above ground, which quantity will be zero?

• x-component of velocity

• y-component of velocity

• x-component of acceleration

• y-component of acceleration

For a projectile, which of the following quantities is CONSTANT throughout the trajectory?

• y-component of velocity

• x-component of velocity

• y-component of position

• x-component of position

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

• True
• False

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

• about 10 m/s²

• about 10 m/s

• 0 m/s²

• 0 m/s

If you throw a baseball straight up, what is its acceleration at the highest point?

• about 10 m/s²

• about 10 m/s

• 0 m/s²

• 0 m/s

Which of the following would NOT be considered a projectile?

• a cannonball thrown straight up

• a cannon ball rolling down a hill

• a cannonball rolling off a table

• a cannonball thrown into 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 farther from the base of the cliff?

• A

• B

• Both at the same distance

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

A projectile is launched with a horizontal speed of 54 m/s. Ignoring air resistance, after 2 seconds it's horizontal speed is...

• 34 m/s

• 54 m/s

Which angle will produce the greatest height (in the absence of air resistance)?

• 0 degrees
• 45 degrees
• 90 degrees
• none of these