A student (whose mass is M1 = 68 kg) is hanging on to a rope (of negligible mass). The rope is hung over a frictionless pulley and is connected at its other end to a crate of mass M2 = 84 kg, as in the figure. The crate is initially hoisted up then allowed to fall while the student continues to hang on to the rope and is lifted up by the rope. What is the magnitude of the acceleration of the student while the crate falls? Your answer should be in m/s2, but enter only the numerical part in the box.