Physical sciences Grade 12 Topic test- April 2023 QUESTION 4 The diagram below shows a bullet of mass 20 g that is travelling horizontally at a velocity Q m.s¹. The bullet strikes a stationary 7 kg box and becomes embedded in it. The bullet and the box together travel on a 2 m long rough horizontal surface X - Y before coming to a stop at point Y. 20 g BULLET-BOX Q m.s -1 7 kg SYSTEM 2 m 4.1 Use the WORK-ENERGY THEOREM to calculate the magnitude of the velocity of the bullet-box system immediately after the bullet strikes the box, given that the frictional force between the box and the surface is 10 N. 4.2 State the principle of conservation of linear momentum in words. 4.3 Calculate the magnitude of the velocity Q m.s¹ with which the bullet strikes the box. 4.4 The bullet experiences a force F when it strikes the box. How is the magnitude of the force experienced by the box compares with that experienced by the bullet? Write only GREATER THAN F, LESS THAN F, or EQUAL TO F. (4) (2) (4) (1) 4.5 Write down the physics law which can be used to explain the answer for QUESTION 4.4 (1) 4.6 A 500 kg car accelerates on a smooth surface from 10m.s¹ to 30m.s¹ in 20 minutes. Use ENERGY PRINCIPLES to calculate the power of the car. (5) [17] TOTAL: 50​