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Vt = Vo + a.t
7 = 12+a.t
7-12 =5a
-5 =5a
a = 5/5 = 1m/s*
F = m.a
= 45.(1)
=45 newton
Vt = Vo - a.t
7 = 12 - a.5
a.5 = 5
a = 1 m/s^2
**) baru cari gayanya (F) :
F = m.a = 45.(1) = 45 N