25,000 miles per hour times 5280 feet per mile equals 132,000,000 feet per hour. divide by 3600 seconds per hour equals 35,667 feet per second. Divide that by 3.2808 equals 11,176 meters per second.
Going back and plugging that into Ke=1/2 (mv^2), and using the original mass at 160,000 tons (145,454,545 kg) and 25,000 MPH equal to (the corrected value of) 11176 m/s, equals a mere 9,084,073,694,941,999 joules
Much better. since a kiloton of TNT yields 4.184 × 10 9 joules (4,184,000,000 joules) the kinetic energy would be the energy equivalent of roughly 2171 MT of TNT. Still a pretty healthy swat, but not a planet wrecker.
No prob! Sometimes breaking out a pen and paper to write down units helps...even in today’s ‘virtual’ world.