1. Which of the following regarding a collision is/are true? a. If you triple your speed your force of impact will be three times greater b. Speed has little effect on impact forces c. If you double your speed, the energy dissipated in a crash is four times greater d. If you double your speed, the energy dissipated in a crash is two times greater

Question

Physics

Talan Middleton

13 April, 12:28

1. Which of the following regarding a collision is/are true? a. If you triple your speed your force of impact will be three times greater b. Speed has little effect on impact forces c. If you double your speed, the energy dissipated in a crash is four times greater d. If you double your speed, the energy dissipated in a crash is two times greater

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Answers (2)

Know the Answer?

Donavan Hays · Answer 1

c

Explanation:

If you double your speed, the energy dissipated in a crash is four times greater

Because impact increases with square of increase in speed.

Leilani Dalton · Answer 2

c. If you double your speed, the energy dissipated in a crash is four times greater.

Explanation:

Given:

Impulse, P = force, f * time, t

= mass, m * velocity, v

Energy = kinetic energy, E = 1/2 * m * v^2

At v2 = 2v1

E1 = 1/2 * m * v1^2

= (m * v1^2) / 2

E2 = 1/2 * m * (2v1^2)

= 1/2 * m * 4v1^2

= m * 2v1^2

(2 * E1) / v1^2 = E2/2v1^2

E1 = E2/4

E2 = 4 * E1