Kinematics in two dimensions - question?

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I'm having problems with this problem. Can anyone help me?

A space vehicle is coasting at a constant velocity of 21.4 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.350 m/s2 in the +x direction. After 47.0 s, the pilot shuts off the RCS thruster. After the RCS thruster is turned off, find the following quantities.

(a) the magnitude of the vehicle's velocity
(b) the direction of the vehicle's velocity relative to the space station Express the direction as an angle measured from the +y direction.
 

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