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A car moves from X to Y with a uniform s...

A car moves from X to Y with a uniform speed `nu_u` and returns to Y with a uniform speed `nu_d` .The average speed for this round trip is:

A

`(nu_u+nu_d)/2`

B

`(2nu_dnu_u)/(nu_d+nu_u)`

C

`sqrt(nu_unu_d)`

D

`(nu_dnu_u)/(nu_d+nu_u)`

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Knowledge Check

  • A car moves from X to Y with a uniform speed V_(u) and returns to Y with a uniform speed V_(d) The average speed for this round trip is

    A
    `sqrt(v_(u)v_(d))`
    B
    `(v_(u)v_(d))/(v_(u)+v_(d))`
    C
    `(v_(u)+v_(d))/(2)`
    D
    `(2v_(u)v_(d))/(v_(d)+v_(u))`

  • When a particle moves in a circle with a uniform speed ………….

    A
    its velocity and acceleration are both constant
    B
    its velocity is constant but the acceleration changes
    C
    its acceleration is constant but the velocity changes
    D
    the velocity and acceleration both change

  • If a body moving in a circular path with uniform speed, then

    A
    the acceleration is directed towards its centre
    B
    velocity and acceleration are perpendicular to each other
    C
    speed of the body is constant but its velocity is varying
    D
    all the above

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