Homework Help: Physics

Posted by Richard on Saturday, May 29, 2010 at 2:53am.

Having trouble determ the formulas for the follow problems.
2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go?
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?

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?

Physics - drwls, Saturday, May 29, 2010 at 5:32am
Let D = distance travelled and Vo be the initial velocity, and a be the acceleration

2. D = Vo * t (no acceleration; V remains Vo)

3. D = Vo*t + (1/2) a t^2
Vo = 8 1/3 m/s ; answer will be in meters

4. Vfinal^2 = Vo^2 + 2 a D
Vfinal = Vo + a t,
but you need to solve for t to use the second formula. The two formulas are consistent.

Answer this Question

Related Questions

Science - I have some equations that I would like checked. Thanxs! 1. An ...
physics - a motorist travels at 80 km/hr for 3 hours and 2 more hours at 100 km/...
Physics - Could you please check my answers and units. Thanxs! 1. An automobile ...
Physics - Could you please check my answers and units.Also, help me with 3 and 4...
math - it took cindy 2h to bike from abbott to benson at a constant speed. the ...
Physics - two locomotives start at the SAME place but Locomotive A gets a half ...
Science-Physics HELP - A S.S. automobile travels N at 40 km/h and a P.A. ...
Algembra - a train leaves a station and travels north at 85 km/hr. Four hours ...
physical science - Brad rides his bike 20 km. He covers the distance in 45 ...
Phyics Word Problems - Could you please check my work and help me with two of ...

For Further Reading

First Name:
School Subject:
Answer: