What were the new speeds of man and son

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Q. A man racing his son has half the kinetic energy of son, who has half the mass of the father. The man speeds up by 0.8m/s and then has the same kinetic energy as the son. What were the new speeds of man and son?

Q. An opera singer in a convertible sings a note at 600 whereas cruising down the highway at 81. What is the frequency heard by a person standing beside the road in front of car? What is the frequency heard by the person standing beside the road behind car?

Reference no: EM1368807

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