What can be the maximum value of the original kinetic energy of disk A so as not to exceed the maximum allowed value of the thermal energy

Answer(b) 60 miles per hour;

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.