[js261994]

A 10 N force acts South and a 70 N force acts due East on a 15 kg object.

Add these two forces graphically and show the resultant force

What is the magnitude of the resultant force?

Calculate the magnitude of the acceleration

[Aurora2000]

You need to translate "South" and "East" into directions.

Draw a quadrant (up=north, right=east, left=west, down=south) and impose a coordinate system, with positive x axis corresponding to east and positive y axis to north. Under these coordinates you have that
the resultant is a force with x component 70N and y component -10N.

The magnitude is , and for the acceleration use .