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3 years ago

6

Which dog has the most kinetic energy? A. A dog of mass 10 kg running with speed 6 m/s B. A dog of mass 8 kg running with speed

4 m/s C. A dog of mass 12 kg running with speed 5 m/s D. A dog of mass 15 kg running with speed 3 m/s

1 answer:

Mars2501 [29]3 years ago

3 0

Answer:

J stands for Joules.

A has the most KE

Explanation:

Dog A

En = 1/2 m * v^2
m = 10 kg
v = 6 m/s
En = 1/2 10 * 6^2
En = 5 * 36
En = 180 J

Dog B

En = 1/2 m * v^2
m = 8 kg
v = 4 m/s
En = 1/2 8 * 4^2
En = 4 * 16
En = 64 J

Dog C

En = 1/2 m * v^2
m = 12 kg
v = 5 m/s
En = 1/2 12 * 5^2
En = 6 * 25
En = 150 J

Dog D

En = 1/2 m * v^2
m = 15 kg
v = 3 m/s
En = 1/2 3 * 3^2
En = 1.5 * 9
En = 13.5 J

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