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1 February, 11:03

In which one of the following situations is zero net work done?

a) a bunch of bananas are placed on a spring scale in the supermarket.

b) a horse pulls a wagon at a constant velocity

c) a sky diver falls from an airplane before opening her parachute

d) a snowball rolls down a hill e a skateboarder steps on a skateboard and begins to roll

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Answers (1)
  1. 1 February, 13:19
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    b) a horse pulls a wagon at a constant velocity

    Explanation:

    As we know that, work done is the dot product of force vector and displacement vector.

    W = F. d

    W=work

    F=Force

    d=Displacement

    We also know that

    F = m a

    m = mass, a = acceleration

    When velocity is constant then rate of change in the velocity will be zero, then we can say that acceleration will be zero.

    When a = 0 Then F = 0

    W = F. d (F=0)

    W = 0

    Therefore option b i correct because horse is going with constant velocity.
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