Duas cargas positivas e puntiforme das quais, uma é o triplo da outra, repelem-se a força de intensidade de 2,7N no vácuo, quanto a distância entre elas é de 10cm, determine a menor das cargas

Could someone . i have tried to solve myself but my calculation is off

What properties of a moving object are used in determining the object's energy of motion

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?