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41.A father r...

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41.A father racing with his son, has one third kinetic energy of the son, who has one-third mass of the father. The father speeds up by 2m/s and then has same kinetic energy as that of the son. The initial speeds of the father and the son are (1) (_/3+1),3(_/3+1) (2) (_/2+1),3(_/2+1) (3) [1/(_/3+1)],[3/(_/3+1)] (4) [1/(_/2+1)],[3/(_/2+1)]

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