A small block is given an initial velocity u measured along the horizontal floor of an elevator moving with a constant downward acceleration a. Because of friction, the block moves only a distance s measured along the floor before it stops sliding. The experiment is repeated with the same initial velocity (magnitude and direction) relative to the floor when the elevator has an upward acceleration of the same magnitude a, and the block slides a shorter distance 52. Determine the elevator acceleration a. Test your result for s = 1.5 m, s2 = 0.5 m. k=0.8. Hint: The accelerations ax are not the same in the two experiments, only aya are the same. y a= m/sec^2