1)d=d1+d2
d1=d2=d/2
t1=d1/v1=d/2/v1=d/2v1
t2=d2/v2=d/2/v2=d/2v2
t=t1+t2
v med=d/t=d/(d/2v1+d/2v2)
Facand calculele obtii: vmed=2v1v2/(v1+v2)
2)Efortul unitar =deformarea relativa•E=>E=Efortul unitar/deformarea relativa
3)Gt-Ff=ma
mgsina-mgcosay=ma(obs:y=coef.frecare)
mg(sina-ycosa)=ma
a=g(sina-ycosa)
2)