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已知:S=5* t^2+3* t-1 分析:若題目中的運算式中各物理量的組織均為Si制的組織,則速度是 V=dS / dt=10* t+3 m/s 那麼V(2)=10*2+3=23 m/s 加速度是a=dV / dt=10 m/s^2 可見,加速度是常數,即a(2)=10 m/s^2
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