Question

What acceleration takes an object to 8m/s from 20m/s over a period of 3s?is the answer -4?

Answer 1

In order to calculate the acceleration, let's use the following formula:

`a=(v_2-v_1)/(\Delta t)`

Where v2 is the final speed, v1 is the initial speed and Delta t is the period of time.

So, for v2 = 8, v1 = 20 and Delta t = 3, we have:

`a=(8-20)/(3)=(-12)/(3)=-4\text{ m/s2}`