Question

How much force is needed to stretch a spring 1.2 m if the spring constant is 8.5 N/m?

7.1 N
7.3 N
9.7 N
10.2 N

Answer 1

D

Explanation:

on edge

Answer 2

F = 10.2 N

Last option is correct.

Explanation:

We can apply Hooke's law to find the force required to stretch the spring.

From Hooke's law, we have

F = k x

Here, F = force required to stretch the spring

k = spring constant

x = length that the spring has been stretched.

We have,

x = 1.2 m

k =8.5

Thus, the force is given by

F = 8.5 × 1.2

F = 10.2 N

Last option is correct.