posted by Helena Beau .
A block of mass M=6 kg and initial velocity v=0.8m/s slides on a frictionless horizontal surface and collides with a relaxed spring of unknown spring constant. The other end of the spring is attached to a wall. If the maximum compression of the spring is 0.2 m, what is the spring constant?
Equate kinetic and potential (spring) energies:
Solve for k
(verify that quantities are in consistent units).
k= 294 N/m
But the correct answer is supposed to be 96 Nm.
Oh I see now. Thanks!