A 5 kg object is subjected to a net force of 15 N to the right. Using free body diagrams, what is the acceleration of the object, and in which direction does it move?

The net force tells us how much the object’s speed changes; by Newton’s second law, acceleration equals force divided by mass. Here the force is 15 N and the mass is 5 kg, so a = 15 N / 5 kg = 3 m/s². This positive acceleration means the velocity will increase in the direction of the force. Therefore the object speeds up and moves to the right. A simple example: a 5‑kg box pushed on a frictionless floor by a 15‑N push will accelerate 3 m/s² to the right.