Friday

April 18, 2014

April 18, 2014

Posted by **Mrs G** on Saturday, March 3, 2012 at 6:01pm.

This question is typical on some driver's license exams: A car moving at 50 km skids 15 m with locked brakes.How far will the car skid with locked brakes at 120 km/h?

- physics -
**Damon**, Saturday, March 3, 2012 at 6:28pmwork done by friction = F d

F is friction force, assume the same in both cases

F d = (1/2) m v^2

F(15) = (1/2) m (50)^2

F d = (1/2) m (120)^2

d=(1/2) m (120)^2 (15)/ [(1/2)m (50)^2 ]

d = 15 (120)^2/(50)^2

**Related Questions**

geo - russias major trading partners include A)brazil, france , and iraq B)japan...

English - I still have to include the following paragraph to my previous letter...

Physics - A large crate filled with physics laboratory equipment must be moved ...

English - I forgot to include these last two sentences. Thank you very much for ...

math (plz help) - In a movie theater, theater A has 30 seats in the first row. ...

Calculus (urgent!!) - A particle moves with its position given by x=cos(2t) and ...

Calculus (urgent!!) - A particle moves with its position given by x=cos(2t) and ...

math - In a movie theater, Theater A has 30 seats in the first row. Each next ...

math - What is the rule for this sequence? 72 , 63 , 54 , 45 , 36 Each number ...

FINITE - Assume that the business makes a profit with probability 0.8 in the ...