Two wires a and b have equal lengths and are made of same material. if the diameter of wire a is twice that of wire b, which has the greater extension for a given load?

It should be A.

Explanation:

Wire A and wire B are made from the same material and have the same length, however, wire A is wider which would allow more electricity or power to be transformed.

Unless im understanding your question wrong, but from what I do understand it is most likely A.

Hope this helps, could you mark me brainliest if it is right?

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s