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-<br />
<br />
3000 m/s<br />
<br />
MυΔt<br />
→<br />
-<br />
Δmu → (u < υ)Δm > 0<br />
υ → + Δυ.<br />
→<br />
a) b)<br />
M<br />
<br />
u<br />
M–m<br />
<br />
m<br />
x<br />
<br />
<br />
<br />
M → υ = Δm → u + (M − Δm)( → υ + Δ → υ)<br />
<br />
→ u<br />
<br />
→<br />
u wzgl = u → − ( υ → + Δυ) → <br />
→<br />
u = u → wzgl + υ → + Δυ<br />
→<br />
→ u wzgl x<br />
-<br />
<br />
MΔ → υ = − → u wzgl Δm<br />
Δt<br />
M Δ υ<br />
→<br />
Δt = Δm<br />
−→ u wzgl <br />
Δt<br />
Δυ<br />
→ Δm<br />
Δt → 0)<br />
Δt Δt <br />
<br />
→<br />
a = − Δm<br />
→<br />
u wzgl<br />
·<br />
Δt M<br />
<br />
<br />
M<br />
108
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