please answer this question simply and clearly for an Alevel maths student?

2. 40 ms-1 15.1 m 30 A golf ball is driven from a point A with a speed of 40ms' at an angle of elevation of 30. On its downward flight, the ball hits an advertising hoarding at a height 15.1m above the level of A, as shown in the diagram above. Find: (a) the time taken by the ball to reach its greatest height above A (b) the time taken by the ball to travel from A to B (c) the speed with which the ball hits the hoarding. 3. An athlete launches a shot put from shoulder height. The height of the shot put, in metres, above the ground t seconds after the launch, can be modelled by the following function: h(t) = 1.7 + 10t - 5t- a) Give the physical meaning of the constant term 1.7 in the context of the model. b) use the model to calculate how many seconds after launch the shot put hits the ground. c) Rearrange h(t) into the form A - B(t - C) and give the values of the constants A, B and C. d) Using your answer to c) or otherwise, find the maximum height of the shot put and the time at which this maximum height is exceeded