1 A particle, of mass 3 kg , moves along a straight line. At time \(t\) seconds, the displacement, \(s\) metres, of the particle from the origin is given by
$$s = 8 t ^ { 3 } + 15$$
- Find the velocity of the particle at time \(t\).
- Find the magnitude of the resultant force acting on the particle when \(t = 2\).