x(t)=-7+5t-4t²
v(t)=s'(t)
v(t)=(-7+5t-4t²)'
v(t)=5-8t
v(3)=5-8×3
v=5-24=-19 м/с
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x(t)=-7+5t-4t²
v(t)=s'(t)
v(t)=(-7+5t-4t²)'
v(t)=5-8t
v(3)=5-8×3
v=5-24=-19 м/с