Friday

April 18, 2014

April 18, 2014

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

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 5:32amLet 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.

**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 ...

Phyics Word Problems - Could you please check my work and help me with two of ...

math - it took cindy 2h to bike from abbott to benson at a constant speed. the ...

Physics - Could you please check my answers and units.Also, help me with 3 and 4...

physical science - Brad rides his bike 20 km. He covers the distance in 45 ...

Physics - I am having a problem answering a physics question: A plane is heading...

physics - An airplane travels 2800 km at a speed of 700 km/h, decreases its ...

Physics - Two trains, each having a speed of 30 km/h, are headed at each other ...