A particle moves along the x-axis. The function v(t) gives the particle's velocity at any time
t≥ 0:
v(t) = t³ - 3t² - 8t+3
What is the particle's velocity v(t) at t = 4?
v(4) =
What is the particle's acceleration a(t) at t = 4?
a(4)=[
At t = 4, is the particle speeding up, slowing down, or neither?