v(t)=s'(t)=(5t^2+2t-7)'=10t+2v(6)=10*6+2=60+2=62
v(t) = s'(t) = (5t^2 + 2t - 7)' = 10t + 2
Подставляем
10 * 6 + 2 = 62 м/с
