SECTION B This section consists of FOUR (4) questions. Answer ALL questions in this section. This sample paper only shows 2 questions for reference only. Sample Question 1: A piece of rock with mass 2.7 kg is released from a great height and falls vertically through the atmosphere. It experiences a resistive force F, given by F.-ky² ghest Velocity Ich) where k is a constant and v is the instantaneous velocity of the rock. The seminal velocity of the rock is measured to be 51 m s. This rock falls through 1.5 km vertically at the terminal velocity before hitting the sea. The specific heat capacity of this rock is determined to be 0.80 kJ kg K. You may ignore the upthrust on the rock due to air and assume that the acceleration of free fall is constant at g-9.8 m s. i) ii) SAMPL Calculate the work done by the weight of the rock when it falls through 1.5 km. iv) If all the work done by weight is converted to heat, calculate the rise in temperature of the rock over the 1.5 km fall assuming that no heat is lost to the surrounding. v) Calculate the heat generated per unit time by the rock when it falls through 1.5 km. [10 mark