A car moving on a straight road with constant velocity 72 km/hr sees an old lady crossing the road at 42 m ahead of the car. if reaction time (time lag between information received and action taken) of car driver is 0.1 sec. find minimum retardation of car so as to avoid accident:
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as we know
a= v+u/t
v = 72km/h or 20m/s
a= 20+0/0.1
a= 200m/s square
a= v+u/t
v = 72km/h or 20m/s
a= 20+0/0.1
a= 200m/s square
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