Posted by **falcon306** on Monday, August 8, 2011 at 7:23pm.

A car is traveling at 14 m/s. How fast would the car need to go to double its kinetic energy? By what factor does the car's kinetic energy increase if its speed is doubled to 28 m/s?

We only get 3 chances and I'm on my last one before I get the question wrong, help?

- Physics -
**bobpursley**, Monday, August 8, 2011 at 7:24pm
KE is proportional to v^2

Or, v is proportional to sqrt KE

so if KE is doubled, v goes up by 1.414

if speed doubled, KE goes up by 4

## Answer this Question

## Related Questions

- Physics - A car is traveling at 10 m/s. By what factor does the car's kinetic ...
- Physics - A car is traveling at 10 m/s. By what factor does the car's kinetic ...
- Physics - A car is traveling at 10 m/s. By what factor does the car's kinetic ...
- PHYSICS - PLEASE HELP - A car is traveling at 10 m/s. By what factor does the ...
- physics - A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass...
- Physics - A) What is the kinetic energy of a 1200kg car traveling at a speed of...
- Physics - A) What is the kinetic energy of a 1200kg car traveling at a speed of...
- physics - A 2000 kg car is moving with a velocity of 50 km/hr. What is its ...
- Physics ~please help me! - 1.) A car (m=1200 kg) moves form 2.0 m/s to 15.0 m/s ...
- Physics - Please Help - Two cars are moving. The first car has twice the mass of...