Posted by **srikala** on Friday, May 25, 2012 at 2:47am.

if a car covers 2/5th of the total distance with v1 speed and 3/5th distance with v2 then average speed is?

- physics -
**Elena**, Friday, May 25, 2012 at 2:32pm
The time

for the first part is

t1 =2•s/5•v1,

for the second part is

t2 = 3•s/5•v2.

The total time is

t =t1+t2 =

=(2•s/5•v1)+( 3•s/5•v2)=

=(s/5) •(2/v1 + 3/v2) =

=(s/5) •{(2•v2+3•v1)/(v1•v2)},

v(ave) = distance/total time =

=s/[(s/5) •{(2•v2+3•v1)/(v1•v2)}]=

=5•(v1•v2)/(3•v1+2v2).

## Answer this Question

## Related Questions

- Calculus - Two points P and Q are connected by a straight road of length d. At ...
- physics - A car moves a distance of 200 km. It covers the first half of the ...
- physics - a car moves from A to B covering a distance of 1000km it covers the ...
- Physics - 1. A person runs 800. m at an average speed of 6.00 m/s and then the ...
- physics - In 1954, Roger Bannister became the first human to run a mile in less ...
- PHYSICS - An odometer in a car has a reading of 50 km at the beginning of a trip...
- physics - in 1954 roger bannister became the first human to run a mile in less ...
- Physics - 1)The speedometer on a car’s dashboard measure average speed average ...
- physics - a car of mass 'm'starts from rest and is driven with constant power....
- physics - a car moves from car A to B covering a distance of 600km/h if it ...