An upward force of acts on a book

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

An upward force of

15\,\text{N}

acts on a book, but the book moves

2\,\text{m}

downward before it stops. Calculate the work done by the upward force. (a)

0\,\text{J}

(b)

-15\,\text{J}

(c)

-30\,\text{J}

(d)

+30\,\text{J}