Free Fall Calculations

A ball is thrown upward in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from?

• 4 seconds 

• 2 seconds 

• 6 seconds 

• 8 seconds 

Which of the following statements applies to the motion of a ball rising and then falling in free fall?
I. The ball has constant acceleration as it moves upward.
II. The ball has constant acceleration at the top of its path.

III. The ball has constant acceleration as it moves downward.

• I only

• III only

• I and III

• I, II, and III

Tags

NGSS.HS-PS2-1

When there is no air resistance, objects of different masses dropped from rest

• fall with equal accelerations and with equal displacements.

• fall with different accelerations and with different displacements.

• fall with equal accelerations and with different displacements.

• fall with different accelerations and with equal displacements.

Tags

NGSS.HS-PS2-1

If an object is dropped from a cliff of 100m, what are your 'givens' you can start with?

CHECK ALL THAT APPLY.

• d = 100 m

• v_i = 0

• t = 100 s

• a = 9.8 m/s²

• v_f = 0

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

You are standing on the top observation deck of the Eiffel Tower in Paris at a height of 300 meters. You drop your cell phone. How fast will the phone be traveling when it hits the ground?

• 9.8 m/s

• 76.68 m/s

• 149.76 m/s

• 46.99 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

An object free falls for 3.5 seconds. How far does it fall?

• 120.05 m

• 17.15 m

• 60.03 m

• 34.3 m

Tags

NGSS.MS-PS2-4

While walking in the classroom you accidently hit a water bottle and it falls off of the 0.75 m desk. How long does it take to reach the ground?

• 0.39 s

• 2.04 s

• 2.76 s

• 0.82 s

Tags

NGSS.MS-PS2-4

The acceleration of a freely falling body on Earth is

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

If you know the time an object is in the air, can you find the Vf of the object?

• Yes, you would have to halve the time since the Ttotal is for both rise and fall and you would have to calculate the height the object rose before finding the Vf

• Yes, you would use the time the object was in the air to find the distance the object travels upward before 

• No, you are not given enough information

• No, it depends on the acceleration, which is different on the way up and on the way down.

Tags

NGSS.HS-PS2-1

A stone is dropped from a height of 80 meters. How long does it take to reach the ground?

• 2 seconds

• 4 seconds

• 5 seconds

• 6 seconds

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4