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 68 times)

karlynnae

  • Hero Member
  • *****
  • Posts: 599
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
Answer to Question 1

C

Answer to Question 2

B



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

Did you know?

Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

For a complete list of videos, visit our video library