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Three vectors are represented by three sides of a triangle in same order. What is their resultant? 


Given the vectors are of the same order. Hence, their resultant vector is equal to zero. 
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Is vector addition commutative?

Yes, vector addition is commutative.

             space straight A with rightwards arrow on top plus straight B with rightwards arrow on top space equals space straight B with rightwards arrow on top plus straight A with rightwards arrow on top

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Comment on the statement that vector subtraction is commutative.

The given statement is wrong.

Vector subtraction does not follow commutative law because, 

                     straight A with rightwards arrow on top minus stack straight B space with rightwards arrow on top not equal to straight B with rightwards arrow on top space minus space straight A with rightwards arrow on top
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Can we add two or more vectors not lying in the same plane?

Yes. Two or more vectors which are not lying in the same plane can be added. 
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State two properties of vector addition.

Two properties of vector addition are:

(i) Addition of vectors is commutative.

That is, (straight A with rightwards harpoon with barb upwards on top space plus stack space B space with rightwards harpoon with barb upwards on top equals space B with rightwards harpoon with barb upwards on top space plus space A with rightwards harpoon with barb upwards on top 

(ii) Addition of vectors is associative.  

Mathematically, left parenthesis straight A with rightwards harpoon with barb upwards on top space plus space straight B with rightwards harpoon with barb upwards on top right parenthesis space plus space straight C with rightwards harpoon with barb upwards on top space equals space straight A with rightwards harpoon with barb upwards on top space plus space left parenthesis straight B with rightwards harpoon with barb upwards on top plus straight C with rightwards harpoon with barb upwards on top right parenthesis

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