A mass M = 8.00 kg block starts at the top of a smooth curved ramp and is released at rest as shown in the figure. It slides down the ramp and onto a horizontal floor that has a rough patch (s = 0.230, Mk = 0.350) of length 3.00 m and then continues to hit and compress a spring by 45.0 cm before rebounding. Determine the spring constant (N/m) of the spring. 2.0 m 3m Rough sellesse