Velocity at 1 second = 8 m/s
Further explanation
Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration
• An equation of uniformly accelerated motion
V = vo + at
Vt² = vo² + 2a (x-xo)
x = distance on t
vo / vi = initial speed
vt / vf = speed on t / final speed
a = acceleration
A person starts to run at 12 m/s and then comes to rest in 3s.
At rest vf=0
vi=12 m/s
t = 3 s
[tex]\tt vf=vi-at(a=-, deceleration)\\\\0=12-a.3\\\\12=a.3\Rightarrow a=4~m/s^2[/tex]
[tex]\tt vf=12-4.1\\\\vf=8~m/s[/tex]
