Jawabanmu

2014-06-20T10:59:07+07:00
Karena perpindahan secara vertikal F = m. g
W = F . s
= m . g . s
= 40 . 10 . 5
= 2000 j
2014-06-20T11:04:55+07:00
M = 40 kg    g = 10
h = 5 m
w...?

w = F. h
F = m.g = 40. 10 = 400

w = 400. 5 = 2000 J