Work-energy theorem, conservative forces, potential energy, collisions.
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Q1 · Work, Energy and Power (Class 11 — ~20% weight) · MEDIUM
A block of mass 2 kg is pushed up a frictionless inclined plane of height 5 m with an initial kinetic energy of 120 J. What is the kinetic energy of the block when it reaches the top of the incline? (Take g = 10 m/s²)
Q2 · Work, Energy and Power (Class 11 — ~20% weight) · EASY
A ball of mass 0.5 kg moving with speed 10 m/s collides head-on with another ball of mass 0.5 kg at rest. If the collision is perfectly elastic, what is the velocity of the second ball after collision?
Q3 · Work, Energy and Power (Class 11 — ~20% weight) · HARD
A particle moves in a force field where the force is given by F = -kx (where k is a constant). The particle moves from x = 0 to x = A. If the work done by this force is -50 J and k = 100 N/m, what is the value of A?
Q4 · Work, Energy and Power (Class 11 — ~20% weight) · EASY
A body of mass 3 kg is moving with a velocity of 10 m/s. Its kinetic energy is: