Relative to another coordinate system S′ (denoted by single prime) moving with a vertical velocity →v0, the equation of motion of the object becomes
m(d→vdt)=−m→g−b→v
m(d→vdt)=−m→g−b(→v−→v0)
m(d→vdt)=m(→g−→v0)−b→v
m[(d→vdt−→v0)]=−m→g−b(→v+→v0)
A
m(d→vdt)=−m→g−b→v
B
m(d→vdt)=−m→g−b(→v−→v0)
C
m[(d→vdt−→v0)]=−m→g−b(→v+→v0)
D
m(d→vdt)=m(→g−→v0)−b→v
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Solution
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The acceleration due to gravity will be the same in both systems →v+→v0=→v′ ⇒→v=→v′−→v0 d→vdt=d→vdt−d→v0dt d→vdt=d→v′dt ⇒md→vdt=m(d→v′dt) ⇒m(d→v′dt)=−mg−b(→v′−→v0)
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