JEE Main Physics question
A particle is moving under the influence of a force given by F = kx, where k is a constant and x is the distance moved. The energy gained by the particle in moving from x = 0 to x = 3 is
Answer: (C)
Solution
U = ∫F dx = ½kx², so the energy gained going from x=0 to x=3 is ½k(3² − 0²) = 4.5k.