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A car is moving with a constant accelara...

A car is moving with a constant accelaration of `4_(m//s^(2))`. On seeing a person infront of it the driver suddenly applies a brake . IF the car is moving with a velolcity of `20_(m//s)` at the moment when driver sees the person and the reaction time of the driver is 2s, then the distance it travels after the movement it sees the person and the just before applying the break is

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