Home Preparation for National Talent Search Examination (NTSE)/ Olympiad
Chapter : 3. Work and Energy
Examples of Potential Energy
Example : 16 What will be the potential energy of a body of mass 2 kg kept at a height of 10 m ? Solution. The potential energy is given by U = mgh Here, m = 2 kg; g = 10 m/s2; h = 10 m ∴ U = 2 × 10 × 10 = 200 J
Example : 17 In lifting a mass of 25 kg to a certain height 1250 J energy is utilized. Calculate to what height it has been lifted ? (Take g = 10 m/s2) Solution. In lifting a mass through a height h the work done is given by U = mgh Here, U = 1250 J; g = 10 m/s2; m = 25 kg ∴ 1250 = 25 × 10 × h or h = 5 m