This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A ball is thrown with an initial velocity of 20 m/s at an angle of 60 above the horizontal. If we ... (Read 166 times)

james

  • Hero Member
  • *****
  • Posts: 573
on: Jul 29, 2018
A ball is thrown with an initial velocity of 20 m/s at an angle of 60 above the horizontal. If we can neglect air resistance, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
 
  A) 10 m/s
  B) 17 m/s
  C) 20 m/s
  D) zero

Question 2

A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
 
  A) 9.8 m/s
  B) 6.3 m/s
  C) 3.6 m/s
  D) 7.2 m/s
  E) 8.9 m/s


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

shoemake

  • Sr. Member
  • ****
  • Posts: 343
Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

B


james

  • Hero Member
  • *****
  • Posts: 573
Reply #2 on: Jul 29, 2018
TY


shoemake

  • Sr. Member
  • ****
  • Posts: 343
Reply #3 on: Jul 29, 2018
You're welcome


« previous next »
 

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

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.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Insert the needle with the beveled side up. Keep the angle low, 10 to 30 degrees. Insert the needle with the beveled side up. Keep the angle low, 10 to 30 degrees.
Locating angle of louis Locating angle of louis
A typical ball-peen hammer. A typical ball-peen hammer.
Constant velocity versus positive velocity Constant velocity versus positive velocity
Compound Angle Formulas Compound Angle Formulas
Ethanol has the molecular formula C2H6O. Which ball and stick model shown above represents ... Ethanol has the molecular formula C2H6O. Which ball and stick model shown above represents ...
Video: Pressure Flow Model Animation

For a complete list of videos, visit our video library