(a)Explain the concept of the conservation of linear momentum. (b)A trolley of mass 20 kg, moving at a speed of 2 metres per second (2m/s), The trolley collides with a stationary toy truck of mass 10 kg. (i) State TWO possible results of this collision. (ii) Calculate the momentum of the truck if it was moving at a speed of four metres per second (4 m/s) towards the trolley. (iii) State TWO possible results of the collision between the truck moving at the speed in (b) (ii) and the trolley. (C) State the forms of energy present (i) before, (ii) during and (iii) after the trolley collides with the stationary toy truck. (i) Before (ii) During (iii) After (D) The toy truck possesses gravitational potential energy. Explain where this energy comes from.

(a)Explain the concept of the conservation of linear momentum. (b)A trolley of mass 20 kg, moving at a speed of 2 metres per second (2m/s), The trolley collides with a stationary toy truck of mass 10 kg. (i) State TWO possible results of this collision. (ii) Calculate the momentum of the truck if it was moving at a speed of four metres per second (4 m/s) towards the trolley. (iii) State TWO possible results of the collision between the truck moving at the speed in (b) (ii) and the trolley. (C) State the forms of energy present (i) before, (ii) during and (iii) after the trolley collides with the stationary toy truck. (i) Before (ii) During (iii) After (D) The toy truck possesses gravitational potential energy. Explain where this energy comes from.