What should the spring constant k of a spring be in order for it to bring a 1480 kg car to rest from a speed of 91.0 km/h such that the passengers undergo a maximum acceleration of 5g?

k = 5572 N/m

Explanation:

Energy stored in the spring:

1)

Kinetic energy of the car:

2)

Spring force:

3)

Combining equation 1 and 2 and solving for k:

4)

Using equation 3 and solve for x:

5)

Combining equation 4 and 5:

6)

frequency or wavelenth of em radiation in a vacuum