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A splash in heard 3.12 s after a stone i...

A splash in heard `3.12` s after a stone is dropped into a well 45 m deep. The speed of sound in air is `[ g =10 ms ^(-2)]`

A

330 `"ms"^(-1)`

B

375 `"ms"^(-1)`

C

340 `"ms"^(-1)`

D

346 `"ms"^(-1)`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-MOTION IN A STRAIGHT LINE -EXERCISE -II
  1. If the distance travelled by a freely falling body in the last second ...

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  2. A ball dropped on to the floor from a height of 10 m rebounds to a hei...

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  3. A splash in heard 3.12 s after a stone is dropped into a well 45 m dee...

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  4. A body is thrown up with a velocity 29.23 "ms"^(-1) distance travelled...

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  5. A body is thrown up with a velocity 40 ms ^(-1). At same time another...

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  6. A stone is dropped into a well of 20 m deep. Another stone is thrown d...

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  7. A body is projected with a velocity 50 "ms"^(-1). Distance travelled i...

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  8. In above problem ratio of distance traveled in first second of upward ...

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  9. A body is projected vertically up with u. Its velocity at half its max...

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  10. A body projected up reaches a point A in its path at the end of 4th se...

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  11. A stone is projected vertically up from the ground with velocity 40 ms...

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  12. A body is projected vertically up with velocity 98 "ms"^(-1). After 2 ...

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  13. The distance travelled by a body during last second of its total fligh...

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  14. A stone is thrown vertically up from a bridge with velocity 3 ms^(-1)....

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  15. A bullet fired vertically up from the ground reaches a height 40 m in ...

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  16. A boy throws n balls per second at regular time intervals. When the fi...

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  17. A stone is dropped freely, while another thrown vertically downward wi...

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  18. A body is throw up with a velocity 'u'. It reaches maximum height 'h'....

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  19. A person in lift which ascents up with acceleration 10 ms^(-2) drops a...

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  20. A body is projected up with velocity u. It reaches a point in its path...

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