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a(h)=50cm=0,5m
α=30o
b=a√3/2
b=0,43m
c^2=0,5m^2+0,43m^2
c^2=0,25m+0,18m
c^2=0,1
c=√0,1~0,32m
a=0,5m
b=0,43m
c=0,32m
sinα=1/2=0,5
Fn=m*g*sinα
Fn=10m/s^2*2kg*0,5
Fn=10N
=====================================
cosα=b/c
cosα=√3/2=0,86
Fs=m*g*cosα
Fs=2kg*10m/s^2*0,86
Fs=17,2N
Fs=m/a
17,2N=2kg/a
a=2kg/17,2N
a=0,11m/s^2
s=at^2/2
2s=at^2
t^2=2s*a
t=√2s*a
t=√2*0,32*0,11
t=0,26s
Pozdrawiam kari9812 :)