Work-energy theorem, KE/PE, conservation, mechanical power.
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Q1 · Work, Energy and Power · MEDIUM
A cyclist applies brakes uniformly and comes to rest after covering 40 m. If the initial velocity was 20 m/s, what is the work done by the braking force if the mass of the cyclist and bicycle together is 60 kg?
Q2 · Work, Energy and Power · HARD
A ball of mass 0.5 kg is dropped from a height of 20 m. Just before hitting the ground, what is its kinetic energy? (Take g = 10 m/s²)
Q3 · Work, Energy and Power · MEDIUM
A block of mass 4 kg is pulled along a rough horizontal surface with a constant force of 30 N applied at an angle of 30° to the horizontal. If the block moves a distance of 8 m and the coefficient of friction is 0.2, what is the work done by the applied force? (Take g = 10 m/s², cos 30° ≈ 0.87)