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{\displaystyle {\vec {a}}={d{\vec {v}} \over dt}.}, , , , , 9,8 / , 9,8 /².
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, , , :{\displaystyle {\vec {j}}={\frac {\mathrm {d} {\vec {a}}}{\mathrm {d} t}},} {\displaystyle {\vec {j}}} .
4-.
, {\displaystyle q_{i}} (, ), {\displaystyle {\ddot {q_{i}}}} {\displaystyle {\dot {q_{i}}}} ; , , . LT −2.
( -):
{\displaystyle {\vec {a}}={d{\vec {v}} \over dt}={d^{2}{\vec {r}} \over dt^{2}}.} {\displaystyle {\vec {r}}(t_{0})={\vec {r}}_{0}} {\displaystyle {\vec {v}}(t_{0})={\vec {v}}_{0}} - t 0, {\displaystyle {\vec {a}}(t),} , , t ( , t 0):{\displaystyle {\vec {v}}(t)={\vec {v}}_{0}+\int _{t_{0}}^{t}{\vec {a}}(t)dt.}{\displaystyle {\vec {r}}(t)={\vec {r}}_{0}+(t-t_{0}){\vec {v}}_{0}+\int _{t_{0}}^{t}\int _{t_{0}}^{t}{\vec {a}}(t)dt^{2}.} , {\displaystyle {\vec {a}}} , . :
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{\displaystyle {\vec {v}}(t)={\vec {v}}_{0}+(t-t_{0}){\vec {a}},}{\displaystyle {\vec {r}}(t)={\vec {r}}_{0}+(t-t_{0}){\vec {v}}_{0}+{(t-t_{0})^{2} \over 2}{\vec {a}}.} , . , ( , ), .
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{\displaystyle v^{2}=u^{2}+2\,as.} u v , a , s .