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

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

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this