To escape a burning building, Arnold has to jump from a thirdstory window that is about 10 m above the ground. Arnold is worried about breaking his leg. The largest bone in Arnold’s leg is the femur, which has a minimum cross-sectional area of about 5 × 10⁻⁴ m and a maximum ultimate strength for compression of about 1.70 × 108 N/m². Arnold has a mass of 82 kg. 

(a) If Arnold lands on the ground with his legs stiff, then his femur can compress only about 5 mm. What will happen to Arnold’s femur? 

(b) Suppose instead of landing on the ground, Arnold lands in deep snow so his legs can move about 30 cm between the time they first hit the snow and the time he comes to a complete stop. What will happen to Arnold’s femur in this case?