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Class 11
PHYSICS
A block of mass m is kept in an elevatio...

A block of mass `m` is kept in an elevation which starts moving downward with an acceleration 'a' as shown in figure. The block is observed by two observers `A` and `B` for a time interval `t_(0)`.
.
The observer `B` finds that the work done by gravity on the block is :

A

`-(1)/(2) mg^(2) t_(1)^(0)`

B

`(1)/(2) mg^(2) t_(0)^(2)`

C

`(1)/(2) mg at_(0)^(2)`

D

`-(1)/(2) mg at_(0)^(2)`

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Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • A block of mass mis kept in an elevation which starts1 moving downward with an acceleration aas shown in figure. The block is observed by two observers A and B for a time interval t_(0) The observer B finds that the work done by gravity on the block is :

    A
    `(1)/(2) mg^(2) t_(0)^(2)`
    B
    `- (1)/(2) mg^(2) t_(0)^(2)`
    C
    `(1)/(2) mg a t_(0)^(2)`
    D
    `- (1)/(2) mg a t_(0)^(2)`

  • A block of mass mis kept in an elevation which starts1 moving downward with an acceleration aas shown in figure. The block is observed by two observers A and B for a time interval t_(0) According to the observer A :

    A
    the work done by gravity is zero
    B
    the work done by normal reaction is zero
    C
    the work done by pseudo-force is zero
    D
    all of the above

  • A block of mass m is kept in an elevation which starts moving downward with an acceleration 'a' as shown in figure. The block is observed by two observers A and B for a time interval t_(0) . . The observer B finds that the work done by pseodo-force on the block is

    A
    zero
    B
    ` -ma^(2) t_(0)`
    C
    ` +ma^(2) t_(0)`
    D
    `-mg at_(0)`

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