Homework Help: Science

Posted by Emma on Sunday, August 26, 2007 at 10:38pm.

I have some equations that I would like checked. Thanxs!

1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration?

3m/s^2 / 4 = .75 m/s

2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go?

d=(30 km/hr)(2 hr)= 60 km

3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds. During these two seconds, how far does it go? (This one I dont understand)

4. An automobile is traveling at 30 km/hr. It accelerates at 3 m/s2 until it has covered 100 meters.. What is its new velocity? (This one I dont understand)

Science - manny, Sunday, August 26, 2007 at 11:12pm
1. Multiply like in number two
2. Right
3. final velocity^2 = initialvelocity^2 + 2*acceleration*(distance traveled)

-- Solve for distance traveled

4. use above equation and solve for final velocity

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