a shot putter shoots a 7.3kg shot from rest to 14m/s in 1.5s. what was the average power?

Question

a shot putter shoots a 7.3kg shot from rest to 14m/s in 1.5s. what was the average power?

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Eirian 5 years 2021-08-18T20:46:47+00:00 1 Answers 19 views 0

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  1. ngocdiep
    0
    2021-08-18T20:48:45+00:00
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    Answer: 477W

    Explanation:

    Given the following :

    Mass (m) = 7.3kg

    Initial Velocity (u) = 0

    Final velocity (v) = 14m/s

    time (t) = 1.5s

    Power = workdone (W) / time (t)

    The workdone can be calculated as the change in kinetic energy (KE) :

    Recall ;

    KE = 0.5mv^2

    Therefore, change in KE is given by:

    0.5mv^2 – 0.5mu^2

    Change in KE = 0.5(7.3)(14^2) – 0.5(7.3)(0^2)

    Change in KE = 715.4J

    Therefore ;

    Average power = Workdone / time

    Workdone = change in KE = 715.4N

    Average power = 715.4 / 1.5

    Average power = 476.93333 W

    = 477W

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