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Point out the CORRECT relation....

Point out the CORRECT relation.

A

`alpha=(Lf,-Li)/(Li(t2-t1|)`

B

`alpha=(-L_i)/(Bj(tf-ti)`

C

`alpha=(Li-Lf)/(Lf(tf-Li)`

D

`alpha=(Lf-Li)/(hf(tf-ti,)`

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