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16 February, 00:15

A cheerleader lifts his 59.6 kg partner straight up off the ground a distance of 0.749 m before

releasing her.

The acceleration of gravity is 9.8 m/s

2

.

If he does this 30 times, how much work has

he done?

Answer in units of J.

+5
Answers (1)
  1. 16 February, 01:43
    0
    m = mass of the partner which the cheerleader lifts = 59.6 kg

    h = height to which the partner is lifted by the cheerleader = 0.749 m

    g = acceleration due to gravity = 9.8 m/s²

    work done by the cheerleader in lifting the partner is same as the potential energy gained by the partner.

    W = work done by the cheerleader in lifting the partner

    PE = potential energy gained

    so W = PE

    potential energy is given as

    PE = mgh

    hence

    W = mgh

    inserting the values in the above formula

    W = 59.6 x 9.8 x 0.749

    W = 437.5 J

    this is the work done in lifting the partner once.

    the cheerleader does this 30 times, hence the total work done is given as

    W' = 30 W

    W' = 30 x 437.5

    W' = 13125 J
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