Projectile Motion_CT

At what point is v_x= 0 m/s?

• A

• B

• C

• D

• None of these points

Which vector pair (arrow pair) correctly represents the acceleration and velocity at point P?

• 
• 
• 
• 

Who do you agree with?

• Anita: “A projectile’s v_x changes because of gravity, and its v_y remains constant.”

• Barry: “Both v_x and v_y are constant.”

• Chris: “A projectile has no acceleration in the vertical dimension but it does accelerate horizontally.”

• Dave: “A projectile has vertical acceleration and a constant horizontal velocity”

A ball is thrown into the air at some angle, with initial velocities v_x (horizontal) and v_y (vertical). At the very top of the ball’s path:

What is its velocity in the vertical direction?

• v_y

• Greater than v_y

• Zero

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

• 90°

• 30°

• 60°

• 45°

A coin tossed vertically upward and it reaches the highest point in 7.0s. at the highest point, the velocity is _______.

• 9.8 m/s

• 0

• 9.8 m/s² 

• 98 m/s²

A ball thrown straight up takes 8 total seconds to complete its journey all the way up and down. 1 second into its journey and 7 seconds into its journey the magnitude of its velocity will be ______________ and its direction _______________.

• opposite, the same

• the same, opposite

• the same, the same

• opposite, opposite

What is the horizontal acceleration of a projectile?

• 0 m/s²
• 9.8 m/s²

A ball is thrown horizontally at a height of 2.2 meters at a velocity of 65 m/s. Assume no air resistance. How far did the ball travel horizontally when it hit the ground?

• 14.3 m
• 30.55 m
• 65 m
• 43.55 m

A ball is thrown horizontally at a height of 2.2 meters at a velocity of 65 m/s. Assume no air resistance. How long until the ball reaches the ground?

• 0.45 s
• 0.67 s
• 0.22 s
• 0.47 s