Question
(a) How fast must a 3000-kg elephant move to have the same kinetic energy as a 65.0-kg sprinter running at 10.0 m/ s? (b) Discuss how the larger energies needed for the movement of larger animals would relate to metabolic rates.
1. $1.47 \textrm{ m/s}$
2. Animals get energy from food. Given the same speed, a larger animal will have more kinetic energy, and thus needs a larger metabolic rate to more quickly convert food energy into kinetic energy.
Solution Video

OpenStax College Physics Solution, Chapter 7, Problem 10 (Problems & Exercises) (1:39)

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