The crate A weighs 100lb and is attached to the springs with constants k1 = 150lb/ft and k...

The crate A weighs 100lb and is attached to the springs with constants k1 = 150lb/ft and k2 = 300 lb/ft. Both springs are unstretched when δ = 0 and the box is centered between the two walls. The angle of the incline is θ = 30°.

If the crate is released from rest after being displaced a distance δ = 6 ft and the coefficient of kinetic friction between the crate and the surface on which it slides is μk= 0.2, determine the speed of the crate when δ = 0.

Figure P4.125