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Define rest and motion....

Define rest and motion.

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Knowledge Check

  • Starting from rest a car moves for sometime with a constant acceleration x and then with a constant retardation y and finally it comes to rest. If the car is in motion for a total time t, the maximum velocity of the car is

    A
    `(xy)/(x+y).t`
    B
    `(xy)/(x-y).t`
    C
    `(x^(2)y^(2))/(x^(2)+y^(2)).t`
    D
    `(x^(2)y^(2))/(x^(2)-y^(2)).t`

  • A uniform circular disc of radius r placed on a rough horizontal plane has initial velocity v_0 and an angular velocity w_0 as shown. The disc comes to rest after moving some distance in the direction of motion. Then

    A
    the friction force acts in the backwards direction
    B
    the point of contact of disc with ground has zero velocity
    C
    `v_0` must be equal to `(romega_0)/2` in magnitude
    D
    `v_0` must be equal to `2romega_0`, in magnitude

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