plis bantuannya kakak dan abang abang sahabt brainly

Diket :
Pers.Posisi,
r(t) = 7.t⁴ + 6.t³ - 5

Tanya :
Percepatan, a(t) = __?

Jawab :
Step 1
---------
kecepatan, 
V(t) = dr/dt
V(t) = d(7.t⁴ + 6.t³ - 5)/dt
V(t) = 28t³ + 18t²

Step 2
--------
Percepatan,
a(t) = dV/dt
a(t) = d(28t³ + 18t²)/dt
a(t) = 84t² + 36t

~~~~~~
)|(
FZA