Question

An object goes from a speed of 9 m/s to a total stop in 3 s. what is the object's acceleration

Answer 1

The object's acceleration is 3 m/s².

Step-by-step explanation:

Given that,

Speed = 9 m/s

Time = 3 sec

We need to calculate the acceleration

Using equation of motion

`v = u+at`

Where, v = final speed

u = initial speed

t = time

a = acceleration

Put the value into the formula

`0 = 9+a*3`

`a = -(9)/(3)`

`a =-3\ m/s^2`

Negative sign shows the deceleration.

Hence, The object's acceleration is 3 m/s².