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Kecepatan(v2)=Ek÷( 1/2×m )
=3600J÷(1/2×90Kg)
=3600J÷45Kg
v=80m/s
v2=(akar dari 80)
v2=8,94 m/s2
Jadi,kecepatan mereka 8,94 m/s2