Spring Tension

Think about the question below. Only one of the answers listed is correct. We'll do some (but probably not all) of these questions in the lectures when you will all be asked to vote on which answer you think is correct. (Soon afterwards, you'll be able to see your responses, and those of the whole class at EVAF.)

Graphic - No title - horsesandspring
A heavy spring is attached to a wall. Two horses are harnessed to the other end and stretch it as far as they can; the tension is then TA
The spring is detached from the wall and the horses reharnessed so that one is attached to each end. Again the horses stretch the spring as far as they can.
Compared with TA is the tension
1
halved
2
the same
3
doubled