« previous next »

Author Question: John throws a rock down with speed 20 m/s from the top of a 30-m tower. If g = 9.8 m/s2 and air ... (Read 115 times)

karlynnae

  • Hero Member
  • *****
  • Posts: 599
on: Jul 28, 2018
John throws a rock down with speed 20 m/s from the top of a 30-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?
 a. 12 m/s
  c. 31 m/s
  b. 28 m/s
  d. 78 m/s

Question 2

Gwen releases a rock at rest from the top of a 50-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground?
 a. 28 m/s
  c. 56 m/s
  b. 31 m/s
  d. 784 m/s


otokexnaru

  • Sr. Member
  • ****
  • Posts: 314
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Granite: a Common Rock in Continental Crust Granite: a Common Rock in Continental Crust
In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con
John Lewis Krimmel’s painting of the Fourth of July in Centre Square Philadelphia (1812) shows the d John Lewis Krimmel’s painting of the Fourth of July in Centre Square Philadelphia (1812) shows the d
The Masses, a leading Socialist magazine, featured drawings by artists, including John Sloan, as wel The Masses, a leading Socialist magazine, featured drawings by artists, including John Sloan, as wel
RAINBOW SERPENT ROCK RAINBOW SERPENT ROCK
Power-tower in Southern California, largest such facility in the world Power-tower in Southern California, largest such facility in the world
Video: Epinephrine/NE (heart rate, altered blood flow, glycogenolysis & bronchodilation)

For a complete list of videos, visit our video library