A sports car is travelling at 30 m/s when it brakes with an acceleration of 4.5 m/s^2. Calculate how much time will it take to stop?​​

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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.