A bit off in your speed conversion, should be around 11,000 m/s.
As it is, the energy contained in that rock would cost about $250 Million if purchased as electricity - it’s about the output of one large nuke reactor operating for a year...and likely equals all of the world’s power production for an hour.
But it is released at one point in virtually one instant. It will be noticed.
25,000 MPH=25,000 miles/hr*5280 ft/mile*60 minutes/hour*60 seconds/minute=475,200,000,000 ft./second.
Divide by 3.2808 to get meters/second and the answer is 144,842,721,287 m/second.
Using statute miles instead of nautical miles (6000 ft./mile), which would give a higher result.