Draw a schematic and determine your thermal resistance values.
All the three answers are attached (in image form). Good luck!
Third
every action has an opposite and equal reaction
When the player slides into the base, all its kinetic energy converts into thermal energy in the legs and the ground.
The thermal energy generated is 940 J, so the initial kinetic energy of the player must be 940 J as well:
where m=55 kg is the mass of the player and v is his speed. Re-arranging the fomula, we can find the value of his speed, v: