Question

A car's velocity changes at a rate of 36 miles per hour in 0.5 hour.

What is its acceleration, in miles/hour2?

(Note: Do not specify units in your answer. Your answer must be only a number.)

Answer 1

72

Explanation:

In order to find the acceleration we need first to defined it, so:

acceleration=((final velocity)-(initial velocity))/time interval

`a=(vf-vi)/dt`

But (vf-vi) actually represents the velocity change, so (vf-vi)/dt represents the velocity change rate. This means that in our case:

`a=(36miles/hour)/(0.5hours)`

`a=72miles/hour^2`

In conclusion the acceleration is
`a=72miles/hour^2`, without units just 72.