Question

What is the acceleration of car if it goes from 60 m/s to a stop in 6 seconds?

Answer 1

Answer: acceleration = -10m/s^2

Explanation:
Use Fab 5 equation to solve for acceleration. (Use equation without d/distance because it is irrelevant for this particular question)

vi = 60m/s
vf = 0m/s because car comes to a stop
t = 6s
a = ?
d = irrelevant

Use a = vf-vi/t

Step by step solution:

a = vf - vi / t
a = 0 - 60 / 6
a = -60 / 6
a = -10m/s^2

Hope this helps! :)

Answer 2

Answer:

$\boxed {\boxed {\sf a= -10 \ m/s^2}}$

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

$a=\frac{v_f-v_i}{t}$

The car came to a stop, so it's final velocity is 0 m/s.

The initial velocity of the car is 60 m/s.

The time is 6 seconds.

$v_f=0 \ m/s\\v_i=60 \ m/s\\t= 6 \ s$

Substitute the values into the formula.

$a=\frac{0 \ m/s-60 \ m/s}{6 \ s }$

Solve the numerator.

• 0 m/s-60 m/s= -60 m/s

$a\frac{-60 \ m/s}{ 6 \ s }$

Divide.

$a= -10 \ m/s^2$

The acceleration of the car is-10 meters per square second. The negative acceleration indicates it is slowing down/stopping.