Jawabanmu

2014-06-12T20:57:04+07:00
W = F x s
    = 250 x 4 = 1000 Joule .

semoga membantu ... maaf kl salah ..

2014-06-12T21:14:53+07:00
W=gaya(f) × perpindahan benda(s)
=250 × 4 = 1000 joule