Question

A vehicle moves in a straight line with an
acceleration of 5 km/h2.
By how much does the speed change each
second?
Answer in units of km/h

Answer 1

You sure about the question because the units don't make sense.

Answer 2

Acceleration is the change in speed over time. In this case the time unit is per hour.

Answer 3

Every hour the speed increases 5 km/h. If you want to know what the change is per second you need to know how many hours are in a second.

Answer 4

Ya that's how the question is I guess you have to convert it but that's why it is so hard. And there is 3600 secs in an hour

Answer 5

okay so that means there are 1/3600 hours in a second right?

Answer 6

so just divide 5km/h by 3600 to get the change in speed per second

Answer 7

.00138889 is a small number

Answer 8

Right and it should be. If the speed only changes 5km/hr per hour then it will only change .083 km/hr per minute which is even smaller by the second which is your number.

Answer 9

There are cars that can accelerate to 120 km/h in 3 seconds. So that acceleration is extremely small.

Answer 10

Wow thank you :)