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19 May, 06:36

What is the value of work done on an object when a 70-newton force moves it 9.0 meters in the same direction as the force? A. 7.8 joules B. 6.3 * 102 joules C. - 7.8 joules D. 0 joules

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  1. 19 May, 09:09
    0
    B. 6.3 x 10² Joules

    Explanation:

    Work is the product of force and distance.

    w = F x d

    where w is the work, F is the force and d is the distance.

    Given,

    F = 70 N, N or Newton is the SI unit of force

    d = 9.0 m, m is the SI unit of distance

    Plugging the number in the work equation we have,

    w = 70 N x 9.0 m = 630 J, Joules is the SI unit of work

    Expressing 630 J in scientific notation we get, 6.3 x 10² J
  2. 19 May, 10:06
    0
    B. 6.3 * 10² J

    Explanation:

    The formula for work (w) done is

    w = f*d

    f = 70 N

    d = 10 m

    w = 70 * 10

    w = 700 J = 7 * 10² J

    w is positive because work is being done on the object.
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