Calculate the Acceleration of this Car

[dvkdcmfvifmceif123]

Homework Statement

A car starts from rest and accelerates uniformly over a time period of 5 seconds for a distance of 100 meters. What is the acceleration of the car?

Relevant Equations

a = (vf − vi) / Δt

I calculated the average speed (100/5=20) and assumed that the speed at 100 m would be double that (20*2=40), since the speed starts at zero. Then i used the formula for acceleration with time and velocity (a = (vf − vi) / Δt) and got the following answer:
a=(40-0)/5=8 m/s/s. This answer makes sense to me, but when i enter it into the test it says it's wrong.

 

[Orodruin]

The test is incorrect or you are somehow managing to enter a format that is not accepted, which would seem strange considering all you probably need to enter is an 8 ...

 

[dvkdcmfvifmceif123]

The test is incorrect or you are somehow managing to enter a format that is not accepted, which would seem strange considering all you probably need to enter is an 8 ...

Thank you. I just had to make sure

 

[kuruman]

Some online scoring algorithms expect units next to numerical answers. Is there a space for units?

 

[Steve4Physics]

a=(40-0)/5=8 m/s/s. This answer makes sense to me, but when i enter it into the test it says it's wrong.

Worth trying 8m/s^2. Or, if there is a way to enter it, 8m/s².

Edit. I should of course have writtten "8 m/s^2" and "8 m/s²".

 

[Orodruin]

Some online scoring algorithms expect units next to numerical answers. Is there a space for units?

This should of course be specified by the instructions.

It should generally not be encouraged to write without a space between the measured value and the unit.

 

[BuddyBoy]

This should of course be specified by the instructions.

It should generally not be encouraged to write without a space between the measured value and the unit.

Great advice. Is "8A" 8 amperes, or the hexadecimal value 8A, or 8 times the variable A? If "8A" is allowed to represent 8 Amperes there are three options, when a space is forgotten between number and it's unit

Where "8 A" is crystal clear, 8 Amperes, only has one meaning. Is why space is required.

 

[Orodruin]

The space is required because it is part of the SI unit convention. See eg https://www.nist.gov/pml/special-pu...rules-and-style-conventions-expressing-values