Work-energy theorem, conservative forces, collisions.
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Q1 · Work, Energy and Power · EASY
Kinetic energy of a 4 kg body moving at 5 m/s is:
Q2 · Work, Energy and Power · MEDIUM
A 50 N force displaces a body by 4 m. The angle between force and displacement is 60°. Work done is:
Q3 · Work, Energy and Power · MEDIUM
A pump lifts 100 kg of water per second to a height of 10 m (g = 10 m/s²). The minimum power required is:
Q4 · Work, Energy and Power · EASY
A body of mass 2 kg is moving with a velocity of 6 m/s. A constant force acts on it and brings it to rest in 3 seconds. The work done by the force is:
Q5 · Work, Energy and Power · MEDIUM
A ball of mass 0.5 kg moving with a speed of 4 m/s collides head-on with another ball of mass 1 kg moving with a speed of 2 m/s in the opposite direction. If the collision is perfectly inelastic, the loss in kinetic energy during collision is: