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7. A car with speed 72km/hr suddenly applies break. The break has maximum ability to deceleratewith 5ms/-2). Find time taken to stop the car after applying breaks?A car with speed 72km/hrsuddenly applies break. The break has maximum ability to decelerate with 5ms^(-2). Find time takento stop the car after applying breaks?(a) 2secec(b) 3sec(c) 4sec(d) 5sec |
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Answer» C) 4sec Explanation: u=72km/hr=20m/s v=0 acc=-5m/s2 v=u+at 0=20+(-5*t) -20=-5t -20/5=-t -4=-t 4=t |
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