[2] 2 A box of emergency supplies is dropped to victims of a natural disaster from a stationary helicopter at a height of 1000 metres. The initial velocity of the box is zero. At time is after being dropped, the acceleration, ams, of the box in the vertically downwards direction is modelled by a 10-1 for 0 < < 10, a=0 for t> 10. (i) Find an expression for the velocity, vms, of the box in the vertically downwards direction in terms of 1 for 0110. Show that for t> 10, v= 50. (ii) Draw a sketch graph of v against for 0