![72 [\frac{km}{h}]*\frac{1000m}{1km} *\frac{1h}{3600s} =20 [m/s]](/tpl/images/1010/8627/d7057.png)
![0=(20)^{2} -2*a*60\\400 = 120*a\\a=3.33[m/s^{2} ]](/tpl/images/1010/8627/96d6e.png)
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