A hawk is chasing a sparrow. At the beginning of the chase, the hawk's kinetic energy is 5.1 Joules. At the end of the chase, the hawk doubles its speed. What is the best prediction for its kinetic energy at the end of the chase? (1 point)
• 51J
• 20.4 J
• 2.55 J
• 10.2 J
Since kinetic energy is proportional to the square of an object's velocity, if the hawk doubles its speed, its kinetic energy will increase by a factor of (2^2) = 4. Therefore, the best prediction for its kinetic energy at the end of the chase would be 4 * 5.1 J = 20.4 J.
Therefore, the correct answer is 20.4 J.