In her gymnastics routine, Regina dismounts from the uneven-parallel bars
and lands straight-legged on the ground, compressing her 0.250-m-long
femur by 2.10 x 10-5 m. If the femur has a cross-sectional area of
3.00 x 10-4 m² and the stress modulus of bone is 2.00 x 1010 N/m², with
how much force does Regina hit the ground?
