Demand for diesel cars, electric cars and public transport rises because they act as cheaper substitutes. Conversely, demand for petrol car accessories falls because accessories and petrol cars are complementary products used together.
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I refute this statement because income growth increases demand primarily for normal goods. For inferior goods, higher purchasing power causes consumers to switch to superior alternatives, reducing the demand for cheaper low-quality goods.
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.
For statement (i) the velocity will remain the same. For statement (ii) the magnitude of velocity will increase. For statement (iii) the magnitude of velocity will decrease due to opposing acceleration.