A 70.0 kg person on a parachute is descending with a terminal velocity of 8.00 m/s. The person tries to avoid leg injury after touch down by crouching down by 60.0 cm. Calculate the total stress on leg bones if the effective cross-sectional area of bones is 6 cm². Assume the breaking stress of the bone is 1x10^9 dyn/cm², and the Young's modulus is 1.4x10^10 dyn/cm².