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never [62]
3 years ago
11

A boy and his dog are running. The dog has a mass of 20kg and the boy has a mass of 45kg.

Physics
1 answer:
Ad libitum [116K]3 years ago
4 0

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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Explanation:

This is a problem of motion in one direction (specifically vertical motion), and the equation that best fulfills this approach is:

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Where:

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a=g=-9.8m/s^{2} is the acceleration due gravity (the negtive sign indicates the gravity is downwards, in the direction of the center of the Earth)

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Knowing this, let's solve (1):

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