Work Energy Theorem — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Work-Energy Theorem Applies to rigid bodies or point masses in inertial frames where mass is constant. Valid for non-relativistic speeds. Start with Newton's Second Law: F net = ma Express acceleration as a = v(dv/dx) using the chain rule Integrate F net dx = m v dv from x i to x f LHS becomes Net Work (integral of Force over distance) RHS integrates to 1/2 m v f 2 - 1/2 m v i 2 Mass must be constant Speeds must be non-relativistic W net includes work done by both conservative and non-conservative forces Confusing Net Work with the work done by a single applied force Thinking Work is a vector because Force is a vector Neglecting the squared term on velocity Assuming the theorem does not apply if friction (non-conservative force) is present