a bone with length of 10 cm and a cross sectional area of 20 cm2 becomes 1 cm shorter (delta l) when 5 pounds of force is applied. if another bone is made of the same material and is the same length, but has a cross sectional area of 40 cm2, how much shorter will it become (delta l) if 5 pounds of force is applied? group of answer choices 2 cm 1 cm .5 cm .25 cm