9. If an object is hunched weight WWI!!! with an initial velocity of 25 Ml. can it ever reach a height of 35 m? It: mm is not important {we neglect air renance). ifyou want you can \"stuns m = 1.0 kg. A. Yu. it will get to exactly that height ENmit willrelchamnximum height of34m C. No. this violate: the conservation of energy law D. Yes. it will mohaheight of42 m . A rock resting atthe edge of a cliffs is dropped over the edge. Ignoring friction, which of the following statements is false? A. The potential energy increases as the kinetic energy decreases B. The mechanical energy of the rock at the top is equal to the mechanical energy at the bottom C. The potential energy decreases at the same rate as the kinetic energy increases D. The potential energy of the rock (relative to the ground} at the top is greater than the kinetic energy at the top Use thefoowr'ng infome'on to answer the net! question. In the construction of large buildings, powerful cranes are used to lift concrete and steel compounds, at a constant speed, to the tap of the building being constructed. Ignoring the initial acceleration of the object lied, which one of the following statements about the lifting done by the crane is incorrect? A. Work is done during the lift. B. Mechanical energy is transferred. C. Potential energy changes occur to the object being lifted. D. Kinetic energy changes occur to the object being lifted. A truck with a mass of4.00 x 10' kg is travelling at 27.73 this; If the driver reduces the truck's speed to 16.67 mfs, then the truck's kinetic energy has changed by A. 2.22x10\"1 B. 9.83x10'] c. 3.20xlo'J n. 1.2sx10'J 2. Determine the period of a simple pendulum having a length of 80cm. 3 marks