3. If a slinky has a mass of 0.5 kg and 100 loops, what is the mass density (m/L) of a slinky that is stretched 5 meters but only 80 loops are stretched? u=M1/L1 m=0.5kg m1=? Mass of the 100 loops Mass of the 80 loops 0.5kg: 100 loops=m1: 80 loops M1=80/100*0.5kg M1=0.4kg L1=5mlength of the stretched part U1=m1/L1 = 0.4 kg/5m U1=0.08kg/m v- mass density of the stretched part is this correct