Question 1020135
{{{a=(v[f]-v[0])/t}}}
We need to use consistent units so either convert seconds to hours or kph to kps.
{{{20 s*((1 hr)/(3600 s))=(1/180)hr}}}
So then,
{{{a=(120-0)/(1/180)=21600}}}{{{km/hr^2}}}