Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.


Have an account? Sign In Now

You must login to ask question.


Forgot Password?

Need An Account, Sign Up Here
Sign InSign Up

Discussion Forum

Discussion Forum Logo Discussion Forum Logo

Discussion Forum Navigation

  • Questions
  • NCERT Solutions
  • MCQ Online Test
  • हिंदी मीडियम
Search
Ask A Question

Mobile menu

Close
Ask a Question
  • Questions
  • NCERT Solutions
  • MCQ Online Test
  • हिंदी मीडियम
Home/energy and simple machines exercise solutions

Discussion Forum Latest Questions

Kriti
Kriti
Asked: September 14, 2026In: Class 9 Science

A ball of mass 2 kg is thrown up with a velocity of 20 m s-1. (i) Identify the sign of the work done by gravity on the ball during its upward motion and its downward motion. (ii) If the ball reaches a height of 19.4 m, how much work was done by air resistance (assume g = 10 m s-2).

Gravity does negative work upward and positive work downward. Initial kinetic energy is 400 J, while work done by gravity is minus 388 J. The work done by air resistance equals minus 12 J.

ball of mass 2 kg is thrown up with a velocity of 20 m s-1class 9 science exploration chapter 7 workenergy and simple machines exercise solutionsncert class 9 science exploration chapter 7 question answersign of the work done by gravity on the ball during its upward motion
  • 1 1 Answer
  • 0 Views
  • 0 Votes
Answer

Sidebar

Ask A Question

Subscribe

  • Popular
  • Answers
  • Mrinal Garg

    Which is the best website providing NCERT Solutions?

    • 120 Answers
  • Richa

    NCERT Books

    • 32 Answers
  • manishq1

    Where can I get NCERT books in PDF format?

    • 27 Answers
  • Rishabh39

    How to learn palmistry online free in hindi?

    • 24 Answers
  • neel43

    Palmistry: Hasth rekha kaise dekhe?

    • 17 Answers
  • Piyush365
    Piyush365 added an answer In (i), according to Newton's first law, an object continues… September 15, 2026 at 4:25 am
  • Piyush365
    Piyush365 added an answer Since the table moves across the floor at a constant… September 15, 2026 at 4:25 am
  • Piyush365
    Piyush365 added an answer Using conservation of energy, the velocity before impact equals square… September 15, 2026 at 4:25 am
  • Piyush365
    Piyush365 added an answer According to the potential energy-displacement graph in Fig. 7.39, total… September 15, 2026 at 4:25 am
  • Piyush365
    Piyush365 added an answer Using the speed-time graph in Fig. 7.38, the car moves… September 15, 2026 at 4:25 am

© 2026 Tiwari Academy. All Rights Reserved