Use Force, Mass and Acceleration to find velocity

[trivk96]

Homework Statement

A 2 kg block initially at rest is pulled to the
right along a horizontal, frictionless surface
by a constant, horizontal force of 13.4 N.
Find the speed of the block after it has
moved 2.4 m.
Answer in units of m/s

Homework Equations

F=MA
V=V_o + at
X=1/2 at²

The Attempt at a Solution

13.4/2=6.7
time=.716417
velocity=4.79989

 

[gneill]

Hi trivk96, Welcome to Physics Forums.

Your time and velocity don't look right. Can you post your work?

 

[trivk96]

This is another try. Can you check if this is right


F=ma
13.4=2a
a=6.7

V=6.7t

x=1/2at²
2.4=.5(6.7)t²

t²=.7164
t=.84641

V=6.7(.85641)
V=5.570978

 

[gneill]

The method looks fine. I think you made a typo transcribing your time value into the final calculation, so the velocity is a bit off. Check it out.

Try using the x² icon in the reply panel header to incorporate exponents in your posts.

 

[trivk96]

Thank You