Jawabanmu

2014-07-07T13:34:20+07:00
Jari-jari bumi kira-kira 6371 km
g₁/g₂ = (r₂/r₁)²
9,8/g₂ = (9371/6371)²
9,8 . 0,68 = g₂
6,664 = g₂

W = m . g
W = 60 . 6,664
W = 399,84 N

:)