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A plank is moving on ground with a veloc...

A plank is moving on ground with a velocity `v` and a block is moving on the plank with respect to it with a velocity `u` as shown in figure. What is the velocity of block with respect to ground ?

A

`v - u` towards right

B

`v - u` towards left

C

`u` towards right

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
`vec v_b = vec v_(b,p) + vec v_p`
=`(-u) + v`(toward sign) `= v - u`.
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Knowledge Check

  • A turck is moving on the ground with a velocity v=12m//s and a box is moving on the truck with respect to it with a velocity u=5m//s as shown in the figure. What is the velocity of the box with respect to the ground?

    A
    `5ms^(-1)` towards right
    B
    `7ms^(-1)` towards left
    C
    `7ms^(-1)` towards right
    D
    `5ms^(-1)` towards left

  • Three blocks are kept as shown in figure Acceleration of 20 kg block with respect to ground is

    A
    `5 m s^(-2)`
    B
    `2 m s^(-2)`
    C
    `1 m s^(-2)`
    D
    none of these

  • A block is dragged on a smooth plane with the help of a rope which moves with a velocity v as shown in figure. The horizontal velocity of the block is :

    A
    v
    B
    `v/(sin theta)`
    C
    `v sin theta`
    D
    `v/(cos theta)`
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