posted by Gail .
TWo blocks of massses 20 kg and 8 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8 kg mas is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at .5 m/s squared, what is the tension in the second string attached to the 8 kg mass?
Use F=ma where m=mass of both blocks.