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a person carries a 10 kg backpack and walks along the pos. x axis for a...

a person carries a 10 kg backpack and walks along the pos. x axis for a distance of 100 m with constant velocity of 2 m/s. what's the net worth done on the backpack?

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Answer #1

As, work done = F.S

                        = F * S * cos(theta)

Here, F = 10 * 9.8 = 98 N

          S = 100 m

   theta = 90 degree (angle between pos. x axis and Force along Y axis)

Thus, net worth done on the backpack = 98 * 100 * cos90

                                                              = 0 J

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