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## Homework Statement

An object moves with a velocity of [4 m/s,-1 m/s, 3 m/s] and is acted on by a force of [-5 N, 0, +5 N]. What is the power of the energy transfer in this interaction?

a. -35 W

b. -5 W

c. 0

d. +5 W

e. +35 W

## Homework Equations

p = Fv

## The Attempt at a Solution

Okay, so I'm trying to find p, and I'm given Fv, and I know that p = Fv. The problem is that it's invalid to multiply these two matrices. So what do I do? I don't know how to multiply these two three-dimensional vectors? What do I need to do first?