tolong bgt nih yg no.31&32 aja..

31)
Dik :
m = 4000 kg
V1 = 72 km/jam = 20 m/s
F = 1000 N
V2 = 36 km/jam = 10 m/s

Dit :
s = ...?

Dij :
W = delta Ek
F.s = 1/2.m.v2²-1/2.m.v1²
F.s = 1/2.m(v2²-v1²)
(-1000).s = 1/2.4000(10²-20²)
(-1000).s = 2000(100-400)
(-1000).s = -600000
s = 600 m

no 32 caranya sama ya

jadikan yg terbaik ya