This should fix throwing behavior.

The linear velocity assigned to thrown objects seems too
low - there is now a 1.5 multiplier to the speed calculated from
mouse movement.

(Also, the timestep is at 1ms again, because the simulator severely limits maximum
velocity at 5ms.)
Limit the force exerted by force fields at close range.

Within r<.001, the field no longer exerts any force. Within r<.005,
the field exerts the same force toward the center as it does at r=.005.

The movement of a ball at the center of the force field is still erratic,
but it is no longer catapulted out of the field at extreme velocities.
Fix the reset in the Throwing example.

The reset button needs to set translateXY to zero.