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## Homework Statement

4. A box of mass M=10 kg is at rest on a frictionless level surface (like an ideally smooth

ice rink). A rope tied to the box is pulled horizontally, such that the tension in the rope is

(vector-->)T = 75 ˆx + 25 ˆz N, where both the x-axis and the z-axis are parallel to the floor. What is

the speed of the box after 0.05 seconds?

1. 0.395 m/s

2. 0.264 m/s

3. 0.198 m/s

4. 0.158 m/s

5. 0.132 m/s

6. 0.000 m/s

## Homework Equations

pf = pi +Fnet*dt

## The Attempt at a Solution

I know how to solve this problem, I'm just having trouble when it comes to the vectors in this case.

Pf = pi + Fnet*dt

{pi = 0) so..

Pf = Fnet*dt

p = mv

mvf = Fnet* dt

vf = (Fnet *dt)/m

But I'm stuck on the vectors...please help!