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The displacement of a body at any time t...

The displacement of a body at any time t after starting is given by `s=15t-0.4t^2`. Find the time when the velocity of the body will be `7ms^-1`.

A

20 s

B

15 s

C

10 s

D

5 s

Text Solution

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The correct Answer is:
C
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Knowledge Check

  • The displacement of a body at any time t after starting is given by s=15t-0.4t^(2) . The velocity of the body will be 7ms^(-1) after time :

    A
    `20s`
    B
    `15s`
    C
    `10s`
    D
    `5s`

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    D
    40 s

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    `0.33 sec`
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    C
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