allanzheng3 allanzheng3

26-01-2020
Physics

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1. A 2000kg truck at rest accelerates to 45m/s in 7 seconds. What is its change in kinetic energy?

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maggie3772 maggie3772

26-01-2020

Answer:

2025000 J

Explanation:

The formula for kinetic energy is KE=.5(m)(v²).

The initial kinetic energy is 0 because it is at rest. .5(m)(0) = 0.

To calculate the final kinetic energy, use the kinetic energy equation. KE = .5(2000)(45²) = 2025000 J.

To find the change in kinetic energy, you do KE(f) - KE(i). 2025000-0 = 2025000 J.

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