berapa usaha total yg dilakukan gsys yg bekerjs pd kotak tersebut

Diketahui:
m = 100 kg
F = 40 N
f gesek = 2 N
s = 75 cm = 0,75 m

Dit : w

F resultan = F - fg
= 40 N - 2 N
= 38 N

W = F resultan . s
= 38 N . 0,75 m
= 28,5 Joule
[B]