15.27: On a frictionless horizontal surface, two bodies make ahead-on
xaj(f+ol 5/z o collision and stick together. Body 1 has a mass of 3.5 kg and initially moves to the right with speed 7.0 m/s. Body 2 initially is at rest. A graph of
xaoo + (flj5/zthe force exerted onto Body 2 from Body 1 during the collision is shown.
What is the mass of Body 2?