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  1. Class 9
  2. Chapter 11 Class 9 - Work and Energy

Transcript

Extra Questions 2 A moving body of 30kg has 60 J of KE. Calculate the speed. Mass of the body = m = 30 kg Kinetic energy = 60 J Let the velocity of the body = v We know that, Kinetic energy = 1/2 mv2 60 = 1/2 × 30 × v2 60 = 15 v2 ∴ v2 = 60/15 v2 = 4 v = √4 v = 2 m/s Velocity of the body is 2 m/s

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.