Aplane starting at rest at the south end of a runway undergoes a constant acceleration of 1.6 m/s2 for a distance of 1400 m before takeoff.
(a) what is the plane's velocity at takeoff?

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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.