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## Homework Statement

Three forces, given by 1 = ( -2.35 i - 2.10 j ) N, 2 = ( 4.90 i + 3.05 j ) N, and 3 = (49.0 j ) N, act on an object to give it an acceleration of magnitude 3.65 m/s2.

(a) What is the direction of the acceleration?

__86.1__° (from the positive x axis)

(b) What is the mass of the object?

_____kg

(c) If the object is initially at rest, what is its speed after 10.0 s?

_____m/s

(d) What are the velocity components of the object after 10.0 s?

(____ i + ____ j) m/s

## Homework Equations

F = ma

Vf = Vi + at

## The Attempt at a Solution

F = ma

m = F/a

To find mass (kg), I divided 2.55 by 3.65 and got 0.7 kg as the answer. That should be the correct answer but it isn't. Can someone please tell me what I did wrong? Thanks.