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8. Two engines cross each other in opposite direction. One engine is whistling a frequencyof 540. People seating in another engine willhear whistle of which frequencies when theyare approaching the first engine and whenhave crossed the first engine. Both enginesare moving with a velocity of 40 meter persecond. Velocity of sound is 340 meter/second​

Answer»

When the stone is RELEASED from elevator, the stone continues to move UPWARDS due to inertia and thus SPEED of the stone just after it is released is U (upwards). Acceleration due to gravity g ACTS in the downward direction.When the stone is released from elevator, the stone continues to move upwards due to inertia and thus speed of the stone just after it is released is u (upwards). Acceleration due to gravity g acts in the downward direction.Explanation:



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