First, if there is ANY resistance when turning the prop in EITHER direction by hand, then you definitely have a problem and it more than likely is NOT electrical (unless it has electronic shift, which I assume this does not - is it a 60hp 3-cyl VRO?). that being said, you would need to determine if the issue (resistance) is coming from the powerhead or lower unit. If there is only resistance in ONE direction, I would guess lower unit. It would take one HECK of a prop strike (high RPM) to break a crankshaft by hitting something with your prop, especially if you have an aluminum prop. Not saying it couldn't be done, but I would start with the lower unit. Also, could you have possibly broken the shifting cable? If the motor was in gear and the shifter was in gear when you hit the rock and the motor slammed out of gear, it is possible that that force could have snapped a weakened shifting cable. That would allow your lower unit to remain in gear even though the shifting lever is in neutral. This happened to my brother-in-law a couple weeks ago. He went to start his Evinrude 175 and the motor started, but was stuck in reverse and wouldn't shift. His shifting cable had broken and was the reason. The shifter was in neutral, so the neutral switch in the control allowed the motor to turn over and start, but it wouldn't shift out of reverse. more