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Q6. A loaded truck of mass 5 tonnes is travelling on rails at 7 m/s and collides with an unloaded truck of mass 2 tonnes travelling at 3 m/s in the same direction. After collision the trucks move as a single body:

(a) Define the terms elastic and inelastic collisions. (2)

(b) Calculate EACH of the following:

(i) the velocity of the combined mass. (6)

(ii) the change in kinetic energy. (4)

(iii) the distance travelled by the trucks after the collision against a constant resistive force of 1400 N. (4)