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Kriti
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Both experience equal magnetic forces by Newton’s third law. The light compass needle pivots freely with negligible friction, whereas the much heavier bar magnet has high inertia and is held stationary by static friction with the surface.  

class 9 science exploration chapter 6 how forces affect motion exercise solutionscompass needle (which is also a magnet) exert a magnetic forcepole of a bar magnet is brought close to a magneticsample question from class 9 chapter 6 how forces affect motionwhereas the bar magnet does not move (fig. 6.42)
Sonal Chauhan
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Using the third equation of motion, the bullet acceleration is minus 10000 meters per second squared. Multiplying by the mass of 0.05 kilograms gives a retarding stopping force of 500 newtons acting opposite to motion.

bullet of mass 50 g moving with a speed of 100 m s-1class 9 science exploration chapter 6 how forces affect motion exercise solutionsclass 9 science exploration chapter 6 question answerestimate the stopping force acting on the bulletsample question from class 9 chapter 6 how forces affect motion
Sonal Chauhan
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Option (iii) Object C is correct. In Fig. 6.37, the position-time curve for Object C indicates changing velocity and acceleration, which requires a non-zero net force by Newton’s laws of motion.

bc and dclass 9 science exploration chapter 6 how forces affect motion exercise solutionsncert class 9 science exploration chapter 6 question answerposition-time graph for four objects asample question from class 9 chapter 6 how forces affect motion