Objects 1 and 2 attract each other with a electrostatic force of 18.9 units. If the charge of object 1 is doubled AND the charge of object 2 is tripled then the new electrostatic force will be units

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.