A boy and his dog are running. The dog has a mass of 20kg and the boy has a mass of 45kg. Suppose both the dog and the boy run at a sp

Question

A boy and his dog are running. The dog has a mass of 20kg and the boy has a mass of 45kg.
Suppose both the dog and the boy run at a speed of 3m/s. Evaluate the expression for kinetic energy to find both of their kinetic energies:
KE of Boy:
KE of Dog:
Suppose the dog speeds up and is now running at a speed of 6m/s. Calculate the dog’s new KE.
New KE of Dog:
Pls answer quick! Thank you

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Tài Đức 5 years 2021-07-30T23:51:02+00:00 1 Answers 56 views 0

Answers ( )

  1. thongdat2
    0
    2021-07-30T23:52:46+00:00
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    Answer:

    Explanation:

    mass of boy =m1=45 kg

    mass of dog =m2=20kg

    the speed of boy=3 m/s

    the speed of dog =3 m/s

    K.E of boy  

    K.E=1/2mv²

    K.E=1/2(45)(3)²

    K.E=202.5 J

    K.E of dog

    K.E=1/2mv²

    K.E=1/2(20)(3)²

    K.E=90 J

    now the new speed of dog is 6 m/s

    therefore new K.E of dog is

    K.E=1/2(20)(6)²

    K.E=360 j

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