#### Answer

Magnitude of force is $30 N$

#### Work Step by Step

Work done by the force:
$W=-\Delta U=-\left( U_{c}-U_{A}\right) =-\left( 45-15\right) =-30J$
Then,
$W=F\Delta x=F\times \left( 6-5\right) =F\times 1m=-30J\Rightarrow F=-30N$

Published by
Wiley

ISBN 10:
1-11823-072-8

ISBN 13:
978-1-11823-072-5

Magnitude of force is $30 N$

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.