1. A rock is thrown from a cliff top at 18 m/s, 25 above the horizontal. It lands on the beach 4.2 s later. h 18 m/s 25 a) What is the height h of the cliff? (4 marks) b) How far from the base of the cliff d did the rock land? (3 marks) 2. A student collects data from the path of a projectile similar to that shown in the diagram. The student records the following data for horizontal displacement from the initial launch position as a function of time. dx (cm) 0.0 0.5 0.9 1.5 1.9 2.5 3.1 t(s) 0.000 0.020 0.040 0.060 0.080 0.100 0.120 a) Plot a graph of dx vs. t on the graph below. dx (cm) 0 0 t(s) (2 marks) b) Calculate the slope of the line, expressing the answer in appropriate units. (2 marks) c) Based on this data and graph, make a statement about the behaviour of projectiles. (1 mark)