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`(a)1.90s``(b)1.70 s``(c)2.30 s``(d)1.40 s`

Answer :

ASolution :

`g_(e) = sqrt(g^(2) + a^(2)) = sqrt((10)^(2) + (4)^(2))` <br> `= 10.77 m//s^(2)` <br> `T = 2pi sqrt((l)/(g_(e)) = 2pi sqrt((1)/(10.77))` <br> `= 1.90 s`