A 69.6 kg fire fighter slides down a pole while a constant frictional force of 263 N s his motion. A horizontal 18.7 kg platform is supported by a spring at the bottom of the pole to cushion the fall. The fire fighter starts from rest 5.80 m above the platform, and the spring constant is 2760 N/m. Calculate the fire fighter's speed just before he collides with the platform.

Answer 1

mgh-energylostslidingpole =final energy

mg(5.8)-263*5.8=1/2 m vf^2
solve for vf

I don't see any connection with the mass of the platform, or spring holding it up.