Question

5. A car starting from rest accelerates at a rate of 7.0 m/s². What is its final speed at

the end of 4.0 seconds?

Answer 1

v=v0+at
v=0+(7)(4)
v=28 m/s

Answer 2

The car's final speed will be 28 m/s

Step-by-step explanation:

We can use the kinematics equation

`v_f=v_0+at`

Note

`v_f` is the final velocity

`v_0` is the initial velocity

`a` is the acceleration

`t` is the time

We are given

`v_0=0\\a=7\\t=4`

Lets evaluate
`v_f`.

Substituting our values into the equation gives us

`v_f=0+7*4`

Lets simplify

`v_f=7*4`

`v_f=28`