a) i) State Newton’s second and third laws of motion.
ii) A 4500 kg rocket is fixed for vertical launching. The burnt fuel is ejected from the rocket at a speed of 850 ms-1. Calculate the mass of fuel ejected per second so that the rocket starts to move with an acceleration of 7.5 ms-2.
b) i) Define coefficient of static friction.
ii) Block A on a horizontal surface of a table is connected to block B by an inelastic string passing over a light and frictionless pulley. Block C is put on top of block A as shown in the diagram below.
The masses of block A and B are 4.0 kg and 2.2 kg respectively . The coefficient of static friction between block A and the table is 0.25. Determine the minimum mass of block C to prevent block A from sliding.
iii) If block C is lifted, draw a diagram of forces acting on block A and calculate the acceleration of the blocks.
[The coefficient of kinetic friction between block A and the table is 0.20]

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