Exam #3 Review

A roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at –7.0 meters per second² to a full stop. Approximately how far does the roller coaster travel during its deceleration?

• 1.0 m

• 2.0 m

• 16 m

• 32 m

Tags

NGSS.HS-PS2-1

An object dropped from rest will have a velocity of approximately 20. meters per second at the end of

• 1.0 s

• 2.0 s

• 3.0 s

• 4.0 s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A brick starts from rest and falls freely from the top of a building to the ground. As the brick falls, its acceleration

• 
  increases and its speed increases

• 
  increases and its speed is constant

• 
  is constant and its speed increases

• 
  is constant and its speed is constant

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

If the mass of an object were doubled, its acceleration due to gravity would be

• halved

• doubled

• unchanged

• quadrupled

Tags

NGSS.HS-PS2-1

A stone is dropped from a bridge 45 meters above the surface of a river. Approximately how many seconds does the stone take to reach the water's surface?

• 1.0s

• 10. s

• 3.0 s

• 22 s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Starting from rest, object A falls freely for 2.0 seconds, and object B falls freely for 4.0 seconds. Compared with object A, object B falls

• 
  one-half as far

• twice as far

• three times as far

• four times as far

What is the final speed of an object that starts from rest and accelerates uniformly at 4.0 meters per second ² over a distance of 8.0 meters?

• 8.0 m/s

• 16 m/s

• 32 m/s

• 
  64 m/s

Tags

NGSS.HS-PS2-1

A projectile is launched horizontally from a height of 65 meters with an initial horizontal speed of 35 meters per second. What is the projectile's horizontal speed after it has fallen 25 meters? [Neglect friction.]

• 22 m/s

• 
  35 m/s

• 
  41 m/s

• 
  280 m/s

Which modification would result in a shorter time of flight for a projectile with mass m, launched with an initial horizontal velocity v_x from a height h above the ground? [Ignore air resistance.]

• Reducing the mass to m/2

• Reducing the height to h/2

• Doubling the initial horizontal velocity to 2v_x

• Doubling the height to 2h

Which modification would result in a greater horizontal distance for a projectile with mass m, launched with an initial horizontal velocity v_x from a height h above the ground? [Ignore air resistance.]

• Reducing the mass to m/2

• Reducing the height to h/2

• Doubling the initial horizontal velocity to 2v_x

• Doubling the height to 2h