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m=500m=0,5 kg
Ek=1/2 m.v²
81=1/2 0,5.v²
v²=Ek:(m:2)
=81:(0,5:2)
=81:0,25
=324
v=√324
=18 m/s
Semoga Membantu :-)
m = 500 gram ⇒ 0,5 kg
Ditanya = v..?
Jawab = Ek = x m x v²
81 = x 0,5 x v²
81 = 0,25 x v²
v² = m/s
v = m/s