The cable of the 1700 kg elevator cab shown the figure snaps when the cab is at rest at the first floor, where the cab bottom is a distance
d = 4.6 m
above a spring of spring constant
k = 0.12 MN/m.
A safety device clamps the cab against guide rails so that a constant frictional force of 4.6 kN opposes the cab's motion. (Assume that the frictional force on the cab is negligible when the cab is stationary.)
A) Find the speed of the cab right before it hits the spring
B)Find the maximum distance x that the spring is compressed (frictional force still acts during compression)

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