Tolong jawab no 11 sampai no 13 pakai rumusnya besok di kumpul

11. ek = 1/ 2 x m x v^2
= 1/2 x 50 x 1,5^2
= 25 x 2,25
= 56.25

.12. energi mekanik = ep + ek
ep = 200-80
= 120

Ek = ½mv²
=½ 50 (1,5)²
=25 x 2,25
= 56,25 J