mohon bantuannya ya guys

52][
p' = p
p' = 4 • 8
p' = 32 kg m/s ← jwb

53][
Ek' = Ek
Ek' = ½ • 4 • 8²
Ek' = 128 J ← jwb

54][
HKM
4 • 8 = (4 + 12) • v'
32 = 16 v'
v' = 2 m/s ← jwb