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V^2 = 0
*asumsi kecepatan peluru tetap, SAMPAI kontak dengan pohon.
Vo^2 = -2as
200^2 = 2 × a × 0.2
-200 × 200 ÷ 2 ÷ 0.2 = a
a = -4000 m/s^2
F = m × a
F = -4000 × 0.025
F = -100 N
Mengapa minus ? Karena "perlambatan".