1. Kinetic energy of a body in motion equals the product of half its mass and the square of its _______   distance   velocity   acceleration   Hint Half-n-half Clue   2. A mass of 11 kg is raised through a vertical distance of 80 m. If the gravitational acceleration is 9.8 m s-2, then the potential energy gained by the mass is   8624 J   880 J   784 J   108 J   Half-n-half Clue   3. The energy losses from machines are mostly dissipated as sound energy.   True   False   4. The energy acquired by a body because of its motion is called potential energy.   True   False   5. The maximum amount of work that can be done by a 60 kW machine in 11 seconds is   5 J   660 J   5 kJ   660 kJ   Half-n-half Clue   6. 'Energy can neither be created nor destroyed' is a statement of the   Law of Conservation of Electric Charges   Law of Conservation of Matter   Law of Conservation of Energy   Half-n-half Clue   7. A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 160 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?   28 m/s   8 m/s   40 m/s   56 m/s   Half-n-half Clue