Work-energy theorem, conservative forces, collisions, power.
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Q1 · Work, Energy and Power · EASY
A body of mass 2 kg moving with velocity 10 m/s has kinetic energy:
Q2 · Work, Energy and Power · MEDIUM
A spring is stretched by 5 cm by a force of 10 N. The work done in stretching it further by 5 cm is:
Q3 · Work, Energy and Power · HARD
A particle of mass m is thrown vertically upward with velocity u. The work done by gravity during its ascent to maximum height is:
Q4 · Work, Energy and Power · EASY
The power of an engine which can lift 600 kg of water per minute to a height of 20 m is (g = 10 m/s²):