Accelation problem, how do I change units (km/h to m/s)?

[pillar]

I made a mistake I meant km/h to m/s^2.
1. ThrustSSC, the world's first supersonic car, accelerates from rest to 1000km/h in 16 s. What is its acceleration in m/s?
2.a=v/t = v-v₀/t-0
3. I'm not sure how to change units (Professor didn't show me.), so can you please now all the work to the problem? Thanks in advance.

 

[Pengwuino]

Use dimensional analysis, first you should convert the speed from km/h to m/s. Whats the conversion between kilometers and meters? And hours to seconds? The first is easy, 1000m = 1km. The second is 1h = 3600s. Simply multiply the speed by the correct conversion factors to get your result.

 

[pillar]

Use dimensional analysis, first you should convert the speed from km/h to m/s. Whats the conversion between kilometers and meters? And hours to seconds? The first is easy, 1000m = 1km. The second is 1h = 3600s. Simply multiply the speed by the correct conversion factors to get your result.

Wait I'm sorry I meant km/h m/s².

 

[Doc Al]

Wait I'm sorry I meant km/h m/s².

Do as Pengwuino says: First convert km/h to m/s.

Hint: 1 km = how many meters? 1 hr = how many seconds? Substitute!

 

[pillar]

Do as Pengwuino says: First convert km/h to m/s.

Hint: 1 km = how many meters? 1 hr = how many seconds? Substitute!

1 km=1000m 1 hr = 3600s I'm not sure how to convert it to m/s^2 Unless I'm suppose to square the 3600, right?

 

[ideasrule]

1 km=1000m 1 hr = 3600s I'm not sure how to convert it to m/s^2 Unless I'm suppose to square the 3600, right?

So this guy accelerated by 1000km/h in 16 s. That's 62.5 km/h every second. What's 62.5 km/h in m/s?

 

[Pengwuino]

You don't want to divide by the time it took him to reach that speed in the first step. If you did, you'd have something with units km/(h*s) which isn't what you want. Put your answer into m/s and then you can divide by the time in seconds which will result in a m/s^2 answer. Fill in the blanks here:

\[<br /> \frac{m}{s} = \frac{{km}}{h}*\frac{{1h}}{{?s}}*\frac{{?m}}{{1km}}<br /> \]<br /> <br />

 

[pillar]

I understand now velocity is m/s, plugging it into a formula (say acceleration = change in velocity/time) time=s velocity= m * s^-1 m * s^-1 * s^-1=m/s^-2=m/s^2

Thanks all.