Freefall and Calculations

A freely falling object on Earth has a speed of 5.0 m s^-1. After falling a further 20 m, its speed it

• 15 m s^-1

• 20 m s^-1

• 25 m s^-1

• 45 m s^-1

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

The acceleration of free fall on a certain planet is 8.0 m s^-2. An object gets dropped from a height and hits the ground after 1.5 s. From what height must the object have been dropped?

• 6.0 m

• 9.0 m

• 11 m

• 12 m

Tags

NGSS.HS-PS2-4

A ball is dropped from rest from a building 35.0 m high. If air resistance is neglected, then the ball will hit the ground with a speed of

• 8.4 m s^-1

• 13.1 m s^-1

• 18.5 m s^-1

• 26.2 m s^-1

Tags

NGSS.HS-PS2-4

A student is asked to solve the following problem:

An object is thrown upwards with a speed of 25 m s^-1. How high will it be when the speed is 12 m s^-1 ?

Which equation will allow the problem to be solved in a SINGLE calculation?

A marble is dropped from the roof of a building and takes 3.2 s to reach the ground.

The approximate height of the building is

• 16 m

• 31 m

• 50 m

• 100 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A girl dropped a stone into an empty well. She heard the sound of the stone hitting the bottom of the well after 4 seconds.

The depth of the well is about

• 20 m

• 40 m

• 80 m

• 160 m

The acceleration due to gravity on Mars is 3.7 m s^-2.

If an object on Mars is launched vertically upwards with an initial speed of 40 m s^-1, its speed after 3.0 s will be

• 11 m s^-1

• 29 m s^-1

• 36 m s^-1

• 51 m s^-1

Tags

NGSS.HS-PS2-1

A lunar landing module is descending to the Moon’s surface at a steady velocity of 10.0 m s^-1. At a height of 120 m a small object falls from its landing gear. Assuming that the Moon’s gravitational acceleration is 1.60 m s^-2, at what speed, in m s^-1 does the object strike the Moon?

• 22.0

• 19.6

• 16.8

• 10.0

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What happens to the velocity of a ball as it is dropped off a cliff? 

• It decreases at a uniform rate 
• It increases at a uniform rate 
• It is constant 
• It increases at a non-uniform rate

Tags

NGSS.HS-PS2-1

A ball is dropped from a building. How fast is it traveling after falling for 1.77 s? (Hint: It's a free falling object)

• 14.76 m/s

• 17.35 m/s

• 18.91 m/s

• 20.03 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4