Question

Two men running towards each other at 4m/s and 6m/s respectively are one kilometre apart. How long before they meet????

Answer 1

Relative velocity = 10m/sec

Answer 2

10 m ---- 1 sec
1 m ------ 1/10
1000 m ---- 1/10 * 1000 = 100 sec

Answer 3

what is relative velocity?

Answer 4

relative to what?

Answer 5

@strawberry_militia: http://en.wikipedia.org/wiki/Relative_velocity

Answer 6

I don't study physics

Answer 7

Basically it's saying from the point of one person how fast is the other one going.

Answer 8

Relative to each other both are going to perceive that the other person is going 10m/s

Answer 9

@ romero, how would you have solved my question?

Answer 10

wwops my 10 is wrong

Answer 11

ok relative to the first person going 4m/s the other is going at him at 6m/s
we say that anything going forwards is positive and anything going opposite is negative
since the person going at 6m/s is going opposite of the guy going 4m/s we say the second guy is going -6m/s but the velocity from 4m/s is transfer to that guy but since it's going forward it's positive 4-6=-2m/s second guy relative for the first. do that same with the other person

Answer 12

This can get very confusing so fast.

Answer 13

relative velocity is the quickest way to get to the answer. But you can think of it this way