Jawabanmu

2014-02-22T16:25:31+07:00
36 km/jam = 10 m/s
Ek = 1/2 m v2
2500 Joule = 1/2 m 100 
2500= 50m
m = 50
w = m g
w = 50 x 10 = 500 N
1 5 1
2014-02-22T19:24:33+07:00
Dik: v= 36 km/jam = 100 m/s
Ek= 2,5 kj = 2500 joule
dit = m?
peny =
ek = 1/2 x m x v²
2500 = 1/2 x m x 100²
2500 = 1/2 x m x 10000
2500 = 5000 x m
m = 2500/5000
m = 0,5 kg