bantu yaa? sama cara nyaa

12.
Cari dulu nilai a ( percepatan ) :
vt^2 - vo^2 = 2as
4^2 - 0^2 = 2.a.3
16 = 6a
a = 16/6
a = 8/3 m/s^2

∑F = ma
F - fg = ma
F - u.mg = ma
F - 0,1.3.10 = 3.8/3
F - 3 = 8
F = 11 N

13.
m = 500g = 0,5kg
Ep = mgΔh
Ep = 0,5.10.(3-1)
Ep = 5.2
Ep =10 J

No 12 D. 11 Newton
No 13 B. 10 Joule