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∆Ek+ ∆Ep= 0
1/2 m(v2²-v1²) + mg(h2-h1)=0
m bisa dicoret, v2=0
tinggal
-1/2v1² +g(h2-h1) = 0
v1² = 2g(h2-h1)
v1 = √(2.10(7,5-4,3))
= 8 m/s
Jadi, kecepatan minimum agar benda sampai ke B adalah 8m/s.