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A man of mass 50kg is running on a plank of mass 150 kg with a speed of 8m/s relative to the plank as shown [both are initially at rest and the velocity of the mas w.r.t ground any how remains constant]. Plank is placed on smooth horizontal surface. The man, while running whistles with frequency fQ. A detector (D) placed on plank detects frequency. The man jumps off with same velocity from point D and slides on the smooth horizontl surface [Assume fl =0 between plunk and horizontal surface]. The speed of sound in still medium is 330 m/s The frequency of sound detected %v detector D, after man jumps of the plank |
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Answer» `332/324 f_(0)` |
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