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pertama, carilah dulu percepatan mobil ....
0 = 20^2 + 2. a. 50
0 = 400 + 100.a
-400 = 100.a
a = -400/100
a = -4 m/s^2 ( tanda - menunjukkan perlambatan, ) ..
lalu, carilah gayanya ..
F = m.a
F = 1500. -4
F = -6000 N ( tanda (-) berarti perlambatan )