Class 9 science
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Total opposing force is 7 N plus 3 N, totaling 10 N, producing a deceleration of 5 m s-2 on the 2 kg mass. Using kinematics, the stopping distance traveled before coming to rest is 10 meters.
Converting 108 km h-1 gives 30 m s-1. The change in momentum is 0.4 kg multiplied by 30 m s-1, which equals 12 kg m s-1. Dividing by 800 N force gives 0.015 seconds contact time.
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.
Mass m1 is F divided by a1 and mass m2 is F divided by a2. The combined acceleration is F divided by the total mass, which simplifies algebraically to a1 a2 divided by the sum of a1 and a2.