3 Two forces each of magnitude 4 N have a resultant of magnitude 6 N .
- Calculate the angle between the two 4 N forces.
The two given forces of magnitude 4 N act on a particle of mass \(m \mathrm {~kg}\) which remains at rest on a smooth horizontal surface. The surface exerts a force of magnitude 3 N on the particle.
- Find \(m\), and give the acute angle between the surface and one of the 4 N forces.