Use Touch instead of the Mouse. You will still be able to control it with the mouse, but Touch plugin also has SpeedAt() and AngleAt() expressions.
You can use them to apply an impulse at angle, for example:
On Touch End -> Sprite apply impulse min(100, Touch.SpeedAt(0)) at angle Touch.AngleAt(0)
But of course you will need to experiment with values.
Instead of physics you can use Bullet or some other behavior.