Work done by force, kinetic energy, potential energy, conservation of energy, power, commercial unit of energy.
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Q1 · Work and Energy (Class 9) · EASY
A force of 20 N displaces a body through 3 m in the direction of the force. How much work is done?
Q2 · Work and Energy (Class 9) · HARD
A body of mass 2 kg is dropped from a height of 20 m. What is its kinetic energy just before it touches the ground? (g = 10 m/s²)
Q3 · Work and Energy (Class 9) · EASY
A body of mass 10 kg is moving with a velocity of 6 m/s. What is its kinetic energy?