A volleyball hit into the air has an initial speed of 10 meters per second. Which vector best represents the angle above the horizontal that the ball should be hit to remain in the air for the greatest amount of time?

• 
  

  $90\degree$

• $60\degree$

• $45\degree$

• $30\degree$

A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 m/s. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch?

• decrease the launch angle and decrease the ball’s initial speed

• decrease the launch angle and increase the ball’s initial speed

• increase the launch angle and decrease the ball’s initial speed

• increase the launch angle and increase the ball’s initial speed

Four identical projectiles are launched with the same initial speed, v, but at various angles above the level ground. Which diagram represents the initial velocity of the projectile that will have the largest total horizontal displacement?

• (1)

• (2)

• (3)

• (4)

A projectile is launched into the air with an initial speed of vi at a launch angle of 30° above the horizontal. The projectile lands on the ground 2.0 seconds later.

How does the maximum altitude of the projectile change as the launch angle is increased from 30° to 45° above the horizontal?

A projectile is launched into the air with an initial speed of vi at a launch angle of 30° above the horizontal. The projectile lands on the ground 2.0 seconds later.

How does the total horizontal distance traveled by the projectile change as the launch angle is increased from 30° to 45° above the horizontal?

A golf ball is hit at an angle of 45° above the horizontal. What is the acceleration of the golf ball at the highest point in its trajectory? [Neglect friction.]

• 9.8 m/s² upward

• 9.8 m/s² downward

• 6.7 m/s² upward

• 0.0 m/s²

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A projectile launched at an angle of 45° above the horizontal travels through the air. Compared to the projectile’s theoretical path with no air friction, the actual trajectory of the projectile with air friction is

• lower and shorter

• lower and longer

• higher and shorter

• . higher and longer

What happens to the object’s acceleration as it travels from A to B?

• It increases

• It decreases

• It remains the same

Tags

NGSS.HS-PS2-1

A golf ball is propelled with an initial velocity of 60 meters per second at 37° above the horizontal. The horizontal component of the golf ball’s initial velocity is

• 30 m/s

• 36 m/s

• 40 m/s

• 48 m/s

A golf ball is hit with an initial velocity of 15 meters per second at an angle of 35° above the horizontal. What is the vertical component of the golf ball’s initial velocity?

• 8.6 m/s

• 9.8 m/s

• 12 m/s

• 15 m/s