Question

A helicopter descends vertically to land with a speed of 4.0 m/s. If the shock absorbers have an initial length of 0.50 m, they compress to 79% of their original length and the air in the tires absorbs 21% of the initial energy as heat, what is the ratio of the spring constant to the helicopter's mass? Assume one landing gear in the craft

i have that the answer is 1.1 kN/kg-m

Could you please show your work and explain? I just don't know how to set up this problem.

Answer 1