An experimental group verified the conservation of mechanical energy of the system composed of hook code and slider with the experimental device shown in figure A. (1) The air cushion needs to be adju

An experimental group verified the conservation of mechanical energy of the system composed of hook code and slider with the experimental device shown in figure A. (1) The air cushion needs to be adjusted before the experiment. (2) The main ruler is 4mm and the cursor is 8, so the reading is 8×0. 1=0.8mm, so the width of the shading strip is d=4.8mm=0.48cm.

v=d△t=0.4m/s

(3) Assuming that the shading bar advances S, the hook code gravitational potential energy decreases: mgs, and the system kinetic energy increases: 12(M+m)(d△t)2.

So we can verify the law of conservation of mechanical energy by comparing the size of mgs and 12(M+m)(d△t)2.

The physical quantities to be measured are: the distance s from the initial position of the shading strip on the slider to the photoelectric gate, and the mass m of the slider.

So the answer is: (2) 0.48; 0.4; The distance s from the initial position of the shading strip on the slider to the photoelectric gate; Slider mass m

(3)mgs， 12(M+m)(d△t)2