- #1

Justabeginner

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## Homework Statement

A force of f= i + 2j- 3k is applied to a particle that moves 10 feet in the direction of i + j. How much work is done?

## Homework Equations

W= ||F|| dot product d

## The Attempt at a Solution

D= 10 cos 45 i + 10 sin 45 j

D= 5sqrt(2) i + 5 sqrt(2) j

F= i + 2j - 3k

W= ||F|| dot product d

W= sqrt(14) dot product (5sqrt(2)i + 5sqrt(2)j)

W= 5sqrt(28) + 5 sqrt(28)

W= 10sqrt(28)

W= 20sqrt(7)

Is this even right? Thanks!