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A jet airplane travelling at the speed of `500 km h^(-1)` ejects its products of combustion at the speed of 1500 km h–1 relative to the jet plane. What is the speed of the latter with respect to an observer on the ground ?

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1000 km/h
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A jet airplance travelling at the speed of 500 km ^(-1) ejects its products of combustion at the speed of 1500 km h^(-1) relative to the jet plane. What is the speed of the burnt gases with respect to observer on the ground ?

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Knowledge Check

  • A car of mass 1200 kg travelling with speed of 60 km/h on a straight road is ahead of a scooter travelling with speed of 60 km/h, then what will the speed of centre of mass of these vehicles? Mass of scooter is 80kg

    A
    `60km//h`
    B
    `72km//h`
    C
    `75km//h`
    D
    `68km//h`

  • A vehicle covers certain distance at constant speed of 20 km h^(-1) in time interval 't' on linear path. Then it covers certain distance at constant speed of 30 km h^(-1) in the same time interval. What is the average speed of the vehicle ?

    A
    `25 km h ^(-1)`
    B
    `24 km h ^(-1)`
    C
    `50 km h ^(-1)`
    D
    `12 km h ^(-1)`

  • A vehicle covers certain distance at constant speed of 20 km h^(-1) in time interval 't' on linear path. Then it covers certain distance at constant speed of 30 km h^(-1) in the same time interval. What is the average speed of the vehicle ?

    A
    `25 km h ^(-1)`
    B
    `24 km h ^(-1)`
    C
    `50 km h ^(-1)`
    D
    `12 km h ^(-1)`

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