A particle of mass 0.5kg is suspended from a vertical string. By means of another string, a second particle is suspended from the first of mass 0.4kg. A force of 10N is applied to the upper string and the particle moves upwards. Find the tension in the lower string and the acceleration of the system.
Note: Assume resistances other than those provided, and g, which is to be approximated by 9.8N, are null.
Answer: Tension 4.44N, acceleration 1.31 m/s^2