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? asked in Science & MathematicsPhysics · 3 years ago

1) 6.21 kg block of concrete is at rest on the ground. How much work is required to lift it to a height of 7.75 m?

(b)True or False (circle one): If the 6.21 kg block is lifted to a height of 7.75 m twice as fast as in Part (a), it takes twice the work.

(c) How high would you have to lift a 4.93 kg block to do the same amount of work as in Part (a)?

formula ( w=fd )

2 Answers

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  • billrussell42
    Lv 7
    3 years ago
    Favorite Answer

    W = 6.21 x 7.75 x 9.8 = 472 J

    b) false

    c) W = 4.93 x H x 9.8 = 472 J

    H = 9.76 m

  • oubaas
    Lv 7
    3 years ago

    Ep = m*g*h = 6.21*9.806*7.75 = 472 joule

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