The day after a practical work session carried out with his students in the second grade, the Physics-Chemistry teacher decides to check their acquisition of knowledge. To do this, he distributes the following document to each of them; it is a recording of the positions of two solids S1 and S2 in motion, of respective masses m1 = 710 g and m2 = 1070 g. The two mobiles launched on an air-cushioned table collided at one point before continuing their movements. The positions were marked at successive equal time intervals T=40 ms. The teacher previously indicated on the recording the positions of a point M of the system formed by the two solids S1 and S2. As a student in the class, you must show the teacher that you know how to apply the law of conservation of the vector-quantity of motion. 1. Say what the point M represents for the system formed by the solids S, and S. 2. Determine: 2.1 the value of the momentum vector P of the system formed by the solids before the impact; 2.2 the value of the momentum vector P' of the system formed by the solids after the shock, 3. Deduce from the previous questions that the momentum vector of the system is conserved.

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The day after a practical work session carried out with his students in the second grade, the Physics-Chemistry teacher decides to check their acquisition of knowledge. To do this, he distributes the following document to each of them; it is a recording of the positions of two solids S1 and S2 in motion, of respective