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First find the acceleration rate (actually deceleration in this case). Equation is a = (v2- u2)/2s where a = acceleration, v = final velocity, u = initial velocity, s = distance

but remember you must use consistent units, 60 km/hour = 16.67 meters/sec

so v = 0, u = 16.67

so a = -16.672/2 x 30 = - 4.63 meters/sec2 , time = (v - u)/a = 16.67/4.63 = 3.60 secs.

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