A metal sphere, mass 2kg, and a wooden sphere, mass 1kg, of the same size, are dropped at the same time from the same height of 5m, on Earth. Which sphere would hit the ground first? Explain.

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Both spheres would hit the ground at the same time.
The spheres are dropped near to ground, so the effect of air resistance on the spheres’ resultant force is negligible.
The resultant force acting on the sphere will be its downward weight.
The ratio of the weight to mass will be 10 for each sphere, so both spheres will free-fall towards the ground at a constant acceleration of 10m/s2.