Hi, LLELLA,Originally Posted byLLELLA

with a ideal elastic spring the force F and the displacement d are proportional:

From

The graph of this function is a straight line with the slope s. So it's answer a).

To 2) I presume that you know that the force equals mass times acceleration. Plug in the values you know and you'll get:

Use the formula given above to calculate the spring constant s. Plug in the values you know and solve for s:

So it's answer a again.

Bye

EB