If a net force of 250 n causes an object to accelerate at 20m/s^2 what must its mass be?

What are the applications of electromagnetic waves

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.