CBSE Class 9 - Science - Work, Energy and Power - Numerical Problems

Work, Energy and Power




Numerical Problems based on Class 9 Physics NCERT Chapter

Q1(CBSE 2012): State the relation between commercial unit of energy and joules.

Answer: Kilowatt hour (kwh)
        1 kwh - 3.6 x 106 joules


Q2: How much work is done on a body of mass 1kg whirling on a circular path of radius 5m?

Answer: Zero


Q3: A body of mass 15 kg undergoes downward displacement of