A car moving along a staright road with speed of 144kmh is brought to a stop within a distance 200m how many sec take to stop it
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it is given in question that
u = 144km/h = 40m/s , v= 0 , s = 200m ,
putting these values in equation v^2 - u^2 = 2as
we got a = -2m/s^2
now putting values in equation v = u +at
we got t = 20s
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