With what force would you have to push a 50 kg skater to increase the skater's speed by 2 m/s/s

Egirls? nah. galaxy or a milky way. i think

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.

Well it depends on the object or substance