Jawabanmu

2016-08-07T00:08:06+07:00
Diket :
a(t) = -6t i - 3j
vo = 4 s

Dit :
t = 4s

Jwb : 
v(t) = vo + ∫a dt
= 4 + ∫(-6t i - 3j)
= 4 + (-3t² i + 3t j)
     
t = 4s
= 4 + (-3t² i + 3t j)
= 4 + (-3(4)² i + 3(4) j)
= 4 + (-48 i + 12 j)

Semoga membantu.........