Question

problema 46 punctul b pls
dau coroana

Answer 1

u1=(2m1v1)/(m1+m2)-v1=(m1-m2)/(m1+m2)*v1=(4-1)/(4+1)*4=3/5*4=12/5=2,5 m/s
u2=(2m1v1)/(m1+m2)-v2
v2=0 m/s
u2=(2m1v1)/(m1+m2)=(2*4*4)/(1+4)=32/5=6,4 m/s
Δ$E_{c AB}$=$L_{N}$+$L_{G} + L_{Ff}$
$L_{N}$=0         $L_{G}$=-μ1*m2*g*BC-μ2*m2*g*h*ctgα =>-m2*u2^2/2=-m2*g*h-μ1*m2*g*BC-μ2*m2*g*h*ctgα =>h=(u2^2-2μ1*g*BC)/(2g(1+μ2*ctgα)