While exploring an ancient Mayan tomb, you discoverthat the walls are closing in

Question

While exploring an ancient Mayan tomb, you discoverthat the walls are closing in on you. By exerting 400 N of force,you are able to keep the wall from coming closer. The work you aredoing on the wall is A ) 3920 J B ) unknown, because the mass of the wall is notgiven. C ) 400 J D ) zero, because the wall is not moving. E ) unknown, because you don't know the speed of thewall. While exploring an ancient Mayan tomb, you discoverthat the walls are closing in on you. By exerting 400 N of force,you are able to keep the wall from coming closer. The work you aredoing on the wall is

Explanation / Answer

This doesn't seem right as you will get really tired holdingthese with so much force.
But, what if your friend went out and found a log the rightlength while you held the walls. Insert the log, let go, andthe walls will stop as the log replaces you and keeps up the neededforce. The same force is being exerted, but it is pretty easyto see that no work is really being done by the log.

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