A 55.0kg women jumps to the floor from a height of 1.5m. a) What is her velocity at the instant before her feet touch the floor? b) If her body comes to rest during a time interval of 8.00 x 10^-3 s, what is the force of the floor on her feet. I got part a which was 5.42m/s down but i cant get part b the answer is suppost to be 3.8 x 10^4 N. How do you do part B.