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721: 08/26(‰Î)08:11 ID:8NTkeVi7(1) AAS
ma-kv+mg
ma-k(v-mg/k)
a/(v-mg/k)+k/m=0
d/dt{log|v-mg/k|+(k/m)t}=0
log|v-mg/k|+(k/m)t=C(=Const.)
log|v-mg/k|=-(k/m)t+C
|v-mg/k|=exp{-(k/m)t+C}
v=}exp(C)exp{-(k/m)t}+mg/k
v=Aexp{-(k/m)t}+mg/k (A}exp(C)‚0)
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