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the second i'm stuck.

A golf ball with mass 4.5×10^-2 kg is moving

in the +x-direction with a speed of 8.65 m/s ,

and a baseball with mass 0.145 kg is moving in

the -y-direction with a speed of 7.2m/s .

--What is the magnitude of the total momentum

of the system that consists of the two balls?

(i got for this one 1.06 kg*m/s using p=mv for

each ball and adding them )

--What is the direction of the total momentum

of the system that consists of the two balls?

Express your answer as an angle measured from

below the x-axis (for this part i tried doing

arctangent but the answer is not right)

any help is good, thanks.