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A-car-is-moving-along-a-straight-road-level-when-the-driver-see-a-boy-crossing-the-road-1-5m-when-the-driver-immediately-applies-the-brakes-which-produces-constant-retardation-in-the-first-second-A




Question Number 156395 by alcohol last updated on 10/Oct/21
A car is moving along a straight road level when   the driver see a boy crossing the road 1.5m when the driver  immediately applies the brakes which produces   constant retardation in the first second. After applying the brakes  the car travels 25m and in the next second it  traveles 15m.   i) find the retardation in m/s^2   ii) show that the car comes to rest at   the point where it started
$${A}\:{car}\:{is}\:{moving}\:{along}\:{a}\:{straight}\:{road}\:{level}\:{when}\: \\ $$$${the}\:{driver}\:{see}\:{a}\:{boy}\:{crossing}\:{the}\:{road}\:\mathrm{1}.\mathrm{5}{m}\:{when}\:{the}\:{driver} \\ $$$${immediately}\:{applies}\:{the}\:{brakes}\:{which}\:{produces} \\ $$$$\:{constant}\:{retardation}\:{in}\:{the}\:{first}\:{second}.\:{After}\:{applying}\:{the}\:{brakes} \\ $$$${the}\:{car}\:{travels}\:\mathrm{25}{m}\:{and}\:{in}\:{the}\:{next}\:{second}\:{it} \\ $$$${traveles}\:\mathrm{15}{m}.\: \\ $$$$\left.{i}\right)\:{find}\:{the}\:{retardation}\:{in}\:{m}/{s}^{\mathrm{2}} \\ $$$$\left.{ii}\right)\:{show}\:{that}\:{the}\:{car}\:{comes}\:{to}\:{rest}\:{at}\: \\ $$$${the}\:{point}\:{where}\:{it}\:{started} \\ $$

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