If you want to have better frost protection, you can add an excess of 0.0200 moles of salt or 0.0200 moles of sugar. Explain which would result in the greater frost protection – sugar or salt. Justify your response.

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.