s=v0t-at^2=14*20-5*400
v=14-5t, t1=14/5=2,8
s=s1+s2=14t1-2,5t1^2+2,5t2^2=14*2,8-2,5*7,84+2,5*17,2=39,2-19,6+43=62,6
s=v0t-at^2=14*20-5*400
v=14-5t, t1=14/5=2,8
s=s1+s2=14t1-2,5t1^2+2,5t2^2=14*2,8-2,5*7,84+2,5*17,2=39,2-19,6+43=62,6