Two horizontal forces act on a 1.4 kg chopping block that can slide over a friction-less kitchen counter, which lies in an xy plane. one force is . find the acceleration of the chopping block in unit-vector notation for each of the following second forces.

Part a)

Part b)

Part c)

Explanation:

As per Newton's II law we know that

F = ma

so we will have

so we will have

Part a)

Part b)

Part c)

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.