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U=20km/hr=20×5/18=50/9m/s v=60km/hr=60×5/18=150/9m/s t=6sec a=v-u/t =(150/9-50/9)/6m/s^2 =100/9÷6m/s^2 =100/54×18/5km/h^2 =6.67km/h^2
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