Question

Tolong dijawab pakek cara, gk usah jawab gk jelas karna pingin poinnya aja

Answer 1

A. r = rt - r0
      = (10i + 8j -2k) -  (5i + 4j + 2k) 
      = 5i + 4j - 4k
b. v = Δs/Δt
      = (5i + 4j - 4k) / 4
      = 5/4 i + j - k
     

Answer 2

r1 = 5i + 4j + 2k 
r2 = 10i + 8j - 2k 
Δt = 4 s 

A. Perpindahan 
S = Δr 
...= r₂ - r₁ 
...= 10i + 8j - 2k - (5i + 4j + 2k) 
...= 10i + 8j - 2k - 5i - 4j - 2k 
...= (5i + 4j - 4k) m

B.Kecepatan rata-rata 
_....Δr 
v = ----- 
......Δt 

......5i + 4j - 4k 
..= ----------------- 
...........4 
..= (5/4 i + j - k) m/s 
Semoga Bermanfaat ^_^