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wb = 200 N
mp = 10 x mb = 10 mb
rp = 2 x rb = 2 rb
Ditanya : wp (w planet) = ....?
Peny :
wb/wp = mb/mp x (rp/rb)²
200/wp = mb/10mb x (2rb/rb)²
200/wp = 1/10 x (2)²
200/wp = 1/10 x 4
200/wp = 4/10
4wp = 200 x 10
wp = 2000/4
wp = 500
Jadi berat benda di permukaan planet adalah 500 N
--- >keterangan <---
wb (w bumi)
mp (massa planet)
mb (massa bumi)
rp (r planet)
rp (r bumi)
wp (w planet)