A rock is a tied to a string that is 0.7 m and whirled in a circle at a constant speed of 6 m/s, what is the centripetal acceleration of the rock? I don’t need the work or explanation, just the answer please!

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.