Maybe there is someone in your trunk trying to get out!
Perhaps a loose exhaust pipe. Check the rear hanger bracket.
Could also be a rod knock making reverberating through your exhaust system.
It's really hard to understand what you're asking here."What causes a knocking sound when your car drops into a hole while driving?"If that's your question, I imagine that it would be the sound of your car dropping into a hole.
Its hard to say... do u know where the noise is coming from?
there could be excessive clearance in the rear differential case if this is a rear wheel drive vehicle.
Sounds like you have big problems, sounds like it has been run low on oil, and or the oil pump quit working, and you wont be driving the car much longer,it sounds like rods knocking, which means new engine time .
loose wheel lug nuts
the back of a car. or when someone is driving really close to the back of your car and is 'tailgating'
That would be the connecting rod bearings and the crankshaft bearings saying goodbye. You have succeeded in destroying the engine.
your foot
If you're driving forward, you aren't backing out the car.
Driving at 50mph or above what causes a loud knocking clicking sound during acceleration?
the persons who car you were driving
No.