# Vector operations

1. May 30, 2010

### amaresh92

can any one tell me how to deal with this question-:

which of the following sets of displacement might be capable of bringing a car to its starting point?
a. 5,10,30 and 50km
b. 40,50,90and 200km
c. 10,20,40and 90km
d. 5,7,9and 16km

2. May 30, 2010

### Andrew Mason

Re: vectors

Can you give us the whole question as it is written, exactly?

AM

3. May 30, 2010

### amaresh92

Re: vectors

but this much only is given.

4. May 30, 2010

### ehild

Re: vectors

Look at the longest displacement and see if the car can make it backwards with the other displacements. The car do not need to go along a straight line.

ehild

5. Jun 2, 2010

### amaresh92

Re: vectors

what is the use of null or zero vector.

6. Jun 2, 2010

### ehild

Re: vectors

A vector with length zero is called null vector or zero vector. If you write the vector sum of all the displacements and the resultant is zero that means that the car returned to its original position.

ehild

7. Jun 2, 2010

### Andrew Mason

Re: vectors

These are not displacements. A displacement is a vector quantity having distance and direction. There is no direction given. So the question that you have provided is not complete.

AM

8. Jun 2, 2010

### ehild

Re: vectors

Those set of numbers are presumably lengths of displacements. If the car goes 50 km at one direction, it never gets back with any displacements of length 5, 10 and 30 km, but displacement vectors of length 5, 7, 9 and 16 km can result in a null vector.

ehild