Объяснение:
4.
[tex]s=2+20t-5t^2\ \ \ \ t=1 c\ \ \ \ \ v(1)=?\\v(t)=s'=(2+20t-5t^2)'=20-2*5t=20-10t.\\v(1)=20-10*1=20-10=10\ (m/c).[/tex]
Ответ: v(1)=10 м/с.
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Объяснение:
4.
[tex]s=2+20t-5t^2\ \ \ \ t=1 c\ \ \ \ \ v(1)=?\\v(t)=s'=(2+20t-5t^2)'=20-2*5t=20-10t.\\v(1)=20-10*1=20-10=10\ (m/c).[/tex]
Ответ: v(1)=10 м/с.