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14 November, 06:46

Awanita is placing items on a shelf that is 200 cm above the ground. She exerts a force of 20 N to lift a box from the floor to the shelf. She does this in 5 s.

What is Awanita's power output? (Power: P = W/t)

4 W

8 W

40 W

800 W

+3
Answers (1)
  1. 14 November, 06:59
    0
    The answer is 8 W

    P = ?

    P = W/t

    P - power, W - work, t - tim

    We have t (t = 5s), but we need to calculate work W:

    W = F * d

    F - force, d - distance

    We know that:

    F = 20 N

    d = 200 cm = 2 m

    W = F * d = 20 N * / 2 m = 40 J

    Now when we know W and t, we can calculate power P:

    P = W/t

    W = 40 J

    t = 5 s

    P = 40 J / 5s = 8 W
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