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The initial speed of an arrow shot from ...

The initial speed of an arrow shot from a bow, at an elevation of `30^(@)," is "15 ms^(–1)`. Find its velocity when it hits the ground back

A

15 m/sec at `30^(@)` clockwise from horizontal

B

15 m/sec at `60^(@)` clockwise from horizontal

C

7.5 m/sec at `30^(@)` clockwise from horizontal

D

7.5 m/sec at `60^(@)` clockwise from horizontal

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • If a projectile is projected with initial speed u and angle theta from horizontal then what will be its average power up to time when it will hit the ground again ?

    A
    100
    B
    200
    C
    300
    D
    0

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    A
    `2:1`
    B
    `3:1`
    C
    `3:2`
    D
    `4:1`

  • An aeroplane is flying vertically upwards. When it is at a height of 1000 m above the ground and moving at a speed of 367 m//s ., a shot is fired at it with a speed of 567 ms^(-1) from a point directly below it. What should be the acceleration of aeroplane so that it may escape from being hit?

    A
    `gt5ms^(-2)`
    B
    `gt10 ms^(-2)`
    C
    `lt10 ms^(-2)`
    D
    Not possible

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