Answers: A) 18mB) 24 m/s

Section C: Choose 5 of the 6 questions in this section (40 marks) Question 1. Projectile Motion (8 marks) A stone is thrown from the top of a sea cliff at 15 m s" at an angle of 20 above the horizontal. It reaches the sea below 2.5 s later sea a. How high is the cliff? (3 b. Find the speed with which the stone hits the water, using conservation of energy. (4) c. What assumption did you need to make in order to answer questions (a) and (b)? (1)