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kotelnikov949
@kotelnikov949
July 2022
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точка движется прямолинейно по закону s(t)=t-4t^2+2t^3(м).найти скорость точки в тот момент времени когда ее ускорение было 16 м/с^2
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kirichekov
Verified answer
S''(t)=a(t)
s''(t)=(t-4t²+2t³)''=(-8t+6t²)'=-8+12t
a(t)=-8+12t
по условию а=16м/с²
12t-8=16, 12t=24. t=2 cек
s'(t)=v(t)
v(t)=(t-4t²+2t³)'=-8t+6t²
v(2)=-8*2+6*2²=-16+24=8
v(2)=8 м/с
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Answers & Comments
Verified answer
S''(t)=a(t)s''(t)=(t-4t²+2t³)''=(-8t+6t²)'=-8+12t
a(t)=-8+12t
по условию а=16м/с²
12t-8=16, 12t=24. t=2 cек
s'(t)=v(t)
v(t)=(t-4t²+2t³)'=-8t+6t²
v(2)=-8*2+6*2²=-16+24=8
v(2)=8 м/с