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Brakes are applied to a car moving with ...

Brakes are applied to a car moving with disengaged engine, bringing it to a halt after 2s. Its velocity at the moment when the breaks are applied if the coefficient of friction between the road and the tyres is 0.4 is

A

`3.92 ms^(-1)`

B

`7.84 ms^(-1)`

C

`11.2 ms^(-1)`

D

`19.6 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`v=u+at, a = mug`
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Knowledge Check

  • Brakes are applied to car moving with disengaged engine, bringing it to a halt after 2s Its velocity at the momnet when the breaks are applied if the coefficient of friction between the road and the tyres is 0.4 is .

    A
    `3.92 ms^(-1)`
    B
    `7.84 ms^(-1)`
    C
    `11.2 ms^(-1)`
    D
    `19.6 ms^(-1)`

  • Find the maximum velocity for skidding for a car moved on a circular track of radius 100 m . The coefficient of friction between the road and tyre is 0.2

    A
    `0.14 m//s`
    B
    `140 m//s`
    C
    `1.4 km//s`
    D
    `14 m//s`

  • A car running with a velocity 72 kmph on a level road is stoped after travelling a distance of 30m after disengaging its engine (g =10m^(-2)) The coefficient of friction between the road and the tyres is .

    A
    `0.33`
    B
    `4.5`
    C
    `0.67`
    D
    `0.8`

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