tolong dibantu... makasihh

a) Kerja atau usaha (W)
W = F . s
W = 7 . 140
W = 980 Nm (Nm setara Joule)

b) Daya (P)
P = W/t

*cari dulu nilai t (waktu):
v = s/t
t = s/v
t = 140/1,2
t = 116,67 s

Maka:
P = W/t
P = 980/116,67
P = 8,3988 Watt ≈ 8,4 Watt