A small planet is discovered to have a layer of electrically charged dust floating at 1000m above the surface because of the balance between the gravitational forces and electrical forces exerted on the dust by the planet. If the dust layer is moved to 2000m above the surface, what will happen to the dust, and why

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?