hi, i did the first part of this problem but on 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.