The crate of mass m is pushed to the left until the linear elastic spring of constant k ha...

The crate of mass m is pushed to the left until the linear elastic spring of constant k has compressed a distance d from its unstretched length ℓ0. The crate is released from rest, and friction between the crate and the horizontal surface is negligible.

Using the work-energy principle, determine the speed of the crate at the instant the spring becomes uncompressed.

Figure P4.8