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Kecepatan awal= 8m/s

Kecepatan akhir= 24m/s

Waktu= 4s

Gaya (F) =20N

m=..?

Percepatan (a) = (24 – 8) ÷ 4= 4m/s

F= m × a

m= F ÷ a

m= 20 ÷ 4= 5

Jawaban= C. 5 kg