a) A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 min 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tones. (Hint: 1 tone = 1000 kg).
b) A boy of mass 60 kg running at 3 m/s jumps on to a trolley of mass 140 kg moving with a velocity of 1.5 m/s in the same direction. What is their common velocity?
c) State Newton's first law of motion.
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His first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
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