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An iron sphere of mass 30 kg has the same diameter as an aluminum sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same:A. acceleration B. momentum C. potential energy D. kinetic energy |
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Answer» Given, Mass of iron m = 30 kg Mass of aluminium M = 10.5 kg Height of iron h = 10m Height of aluminum H = 10m We know, Kinetic energy =\(\frac{1}{2}\)mv2 Potential energy = m × g × h Momentum = mass × velocity So kinetic energy, potential energy, kinetic energy and momentum depends of the mass of the body, they can’t be same for both spheres. But acceleration due to gravity g = 10 ms-2 is same for all the objects at some height, irrespective of their mass and height. |
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