Question

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​

Answer 1

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