Bonsoir je me suis pris très tard mais si quelqu'un peut m'aider franchement ça serait sympatoch ( 1ere spé physique): Un système de masse m = 3,0 kg goulotte de 10 m. • Calculer la variation de son énergie potentielle de pesanteur au cours de la chute. Donnée : g= 10 N. kg-1

You yeah with the side of the yeah with a little bit of yeah.

45 is the correct answer

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.