A sailor weighing 160 lbs. is called to his Engine Room battle station. To get to his station he must slide down three separate sets of ladders (using rice packets and landing on his knees each time)--all at a 68 degree angle. The first ladder drop is 15ft, the second is 10 feet and the third is 20 feet. Question: what is the force of impact on this seaman's knees? Please provide the proper formula along with the math and finally the answer in "laymans terms". Thank you!

Question

A sailor weighing 160 lbs. is called to his Engine Room battle station. To get to his station he must slide down three separate sets of ladders (using rice packets and landing on his knees each time)--all at a 68 degree angle. The first ladder drop is 15ft, the second is 10 feet and the third is 20 feet.  Question: what is the force of impact on this seaman's knees? Please provide the proper formula along with the math and finally the answer in "laymans terms".  Thank you!