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physics·NCERT Class 11·Oscillations

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A heavy bob, a long string — the pendulum swings slower. Increase the mass — does it swing faster? The answer will surprise you.

›For spring-mass: T = 2π√(m/k); for pendulum: T = 2π√(L/g).
›KE + PE = constant = ½kA² (total energy depends on amplitude).