Make 2022 aiming speed-over-ground more reasonable

We are not launching balls with a 12 m/s speed-over ground.

Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
Change-Id: Id5fdaaa5850d89fcbc8cf18fc3fe554cb6fbbb63
diff --git a/y2022/control_loops/superstructure/turret/aiming.cc b/y2022/control_loops/superstructure/turret/aiming.cc
index e1d24f8..643adbc 100644
--- a/y2022/control_loops/superstructure/turret/aiming.cc
+++ b/y2022/control_loops/superstructure/turret/aiming.cc
@@ -15,7 +15,7 @@
 namespace {
 // Average speed-over-ground of the ball on its way to the target. Our current
 // model assumes constant ball velocity regardless of shot distance.
-constexpr double kBallSpeedOverGround = 12.0;  // m/s
+constexpr double kBallSpeedOverGround = 2.0;  // m/s
 
 // If the turret is at zero, then it will be at this angle at which the shot
 // will leave the robot. I.e., if the turret is at zero, then the shot will go