A car’s speed increases uniformly from 20.0 km/h to 60.0 km/h in 20.0 s.
a=v1+v22t=0.56 ms2.a=\frac{v_1+v_2}{2t}=0.56~\frac m{s^2}.a=2tv1+v2=0.56 s2m.
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