Question

A block is attached to a spring undergoes simple harmonic motion on a horizontal frictionless surface. Its total energy is 50J. When the displacement is half the amplitude, the kinetic energy is:

Answer 1

Answer:

37.5 J

Explanation:

   K=E-U = (1/2*K*A^2) + (1/2*K*(A/2)^2)

=>K=3/4(1/2* KA^2)

=>K=3/4 *E

=>K=3/4 * 50J

=>K=37.5J