Projectile motion

Which best describes the horizontal motion of a projectile, assuming no air resistance?

• Acceleration of -10 m/s²

• Acceleration of -5 m/s²

• An increasing acceleration every second

• Constant velocity

Which best describes the vertical motion of a projectile, assuming no air resistance?

• Acceleration of -10 m/s²

• Accelerations of -5 m/s²

• An increasing acceleration every second

• Constant velocity

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

A soccer ball is kicked horizontally off a cliff. What information is needed to find the time to fall?

• The height of the cliff

• The initial speed of the ball

• The mass of the ball

• All of these

A player kicks a ball across the field. At the very top, what is the acceleration of the ball?

• It is accelerating to the right

• There is no acceleration at the top

• 10 m/s² up

• 10 m/s² down

What variable letter is range?

• X
• Y
• V_x
• V_y

What variable letter is altitude?

• X
• V_x
• Y
• V_y

For a projectile that goes up and comes by down to the same altitude, what is the overall value for y?

• 1/2 g t²
• -2 V_y / g
• 0
• sinΘ

What variable letter is horizontal velocity?

• X
• Y
• V_x
• V_y

What variable letter is vertical velocity?

• X
• Y
• V_x
• V_y