Jawabanmu

2013-12-19T21:48:05+07:00
T =7 menit = 420 sekon
P = w/t = 84000/420 = 200 watt
2013-12-20T06:47:06+07:00
P = W/t = F v (GLB)
P = Ek/t (GLBB)

Satuan daya : 1 watt = 1 Joule/det = 107erg/det
Dimensi daya : [P] =
MLT²T¯³

P= W/t
  =  84000 J /7.60
  =  200 watt