# What should be the spring constant k of a spring designed to bring a 1240 kg car to rest from a speed of 92 km?

1. What should be the spring constant k of a spring designed to bring a 1240 kg car to rest from a speed of 92 km/h so that the occupants undergo a maximum acceleration of 5.0 g?

Yes, this is for homework.

distance to stop in = v^2 / 2 a == 25.55^2 / 2 . 5 . 9.8 = 6.66 m

1/2 . m . v^2 = 1/2 . k . x^2

1240 . 25.55^2 = k . 25.55^2 / 98

k = 31689 N / m

2. What can be said about K-selected species relative to the carrying capacity of their habitat?

a. They sometimes exceed the carrying capacity.

b. They always exceed the carrying capacity.

c. They never approach the carrying capacity.

d. They never exceed the carrying capacity.

‘A’ is the best answer. Population size fairly stable and usually close to carrying capacity (K).

3. What should be the spring constant k of a spring designed to bring a 1320 kg car to rest from a speed of 93 km/h so that the occupants undergo a maximum acceleration of 5.0 g?