Rephrasing the first two parts:
(i) At rest means speed is zero, so how can you tell from the graph that the initial speed is zero? (What about a displacement time graph tells you the speed or velocity?)
(ii) What part of the graph gives you the acceleration? If there were no air resistance, acceleration would be purely down to gravity, so would be a constant 9.81m/s2. How can you tell from the graph it's not constant?
(iii) is the hardest for me - you need the speed AT THAT POINT rather than the average speed up to that point so it requires drawing a tangent to the line at the point where t = 0,4 s and finding the gradient of that line. It's the drawing the tangent I have difficulty with, I find it hard to judge by eye whether I've got it right. There are tricks you can use if you have mirror or tracing paper but since you won't have them in an exam it's probably best to try by eye.