A constant horizontal force a pushes a kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn.

A constant horizontal force a pushes a kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn. Figure 5-37 gives the package's x and y velocity components versus time t. What are the (a) magnitude and (b) direction of a? Give the direction as a positive or negative angle of magnitude less than 180° relative to the +x-axis.