Work-energy theorem, conservative forces, collisions.
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Q1 · Work, Energy and Power · EASY
A force of 10 N displaces a body by 5 m in the direction of force. The work done is:
Q2 · Work, Energy and Power · MEDIUM
A machine does 1000 J of work in 10 seconds. What is its power?
Q3 · Work, Energy and Power · EASY
The kinetic energy of a body of mass 2 kg moving with velocity 10 m/s is:
Q4 · Work, Energy and Power · HARD
A body of mass 1 kg is dropped from a height of 20 m. What is its kinetic energy just before hitting the ground? (Take g = 10 m/s²)