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    Physics
    General
    Easy

    Question

    straight A space ball space of space mass space 1 space kg space is space thrown space up space with space an space initial space speed space of space 4 space straight m divided by straight s. space straight A space second space ball space of space mass space 2 space kg space is space released space from space rest space from space some space height space as space shown space in space figure. space Choose space the space correct space statement left parenthesis straight s right parenthesis.

    1. The space centre space of space mass space of space the space two space balls space comes space down space with space acceleration space straight g divided by 3
    2. The space centre space of space mass space first space moves space up space and space then space comes space down.
    3. The space acceleration space of space the space centre space of space mass space is space straight g space downwards.
    4. The space centre space of space mass space of space the space two space balls space remains space stationary.

    The correct answers are: The space centre space of space mass space first space moves space up space and space then space comes space down., The space acceleration space of space the space centre space of space mass space is space straight g space downwards.

      Sol colon space The space initial space velocity space of space CM space is space upward. space The space acceleration space of space the space CM space is space ‘ straight g ’ space downward.

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      straight A space man space is space standing space on space straight a space plank space which space is space placed space on space smooth space horizontal space surface. space There space is space sufficient space friction space between space feet space of space man space and space plank. space Now space man space starts space running space over space plank comma space correct space statement space is divided by are

      straight A space man space is space standing space on space straight a space plank space which space is space placed space on space smooth space horizontal space surface. space There space is space sufficient space friction space between space feet space of space man space and space plank. space Now space man space starts space running space over space plank comma space correct space statement space is divided by are

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      straight A space block space of space mass space straight m space rests space on space straight a space stationary space wedge space of space mass space straight M. space The space wedge space can space slide space freely space on space straight a space smooth space horizontal space surface space as space shown space in space figure. space If space the space block space starts space from space rest                                       

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      From space the space circular space disc space of space radius space 4 straight R space two space small space discs space of space radius space straight R space are space cut space off. space The space centre space of space mass space of space the space new space structure space will space be space at

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      straight A space man space of space mass space straight M space stands space at space one space end space of space straight a space stationary space plank space of space length space straight L comma space lying space on space straight a space smooth space surface. space The space man space walks space to space the space other space end space of space the space plank. space If space the space mass space of space the space plank space is space straight M divided by 3 comma space the space distance space that space the space man space moves space relative space to space the space ground space is

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