During a circus act, one performer swings upside down hanging from a trapeze holding another, also upside down, performer by the legs. if the upward force on the lower performer is three times her weight, how much do the bones of her upper leg stretch? you may assume each is equivalent to a uniform rod 35.0 cm long and 1.80 cm in radius. her mass is 60.0 kg. a)19.0 km
b)19.0 cm
c)19.0 mm
d)19.0 î¼m