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t=waktu
jarak 2 = percepatan/2 x waktu²
200 = 10 t + 2/2 t²
200 = 10t + t²
t² +10t -200 = 0
(t-10)(t+20) =0
t= 10 atau t = -20
waktu tidak mungkin minus
maka
t=10 detik
jarak dari A ke titik temu = 10 x 10 = 100 meter
maaf jika jawaban saya salah