Proton Distance Help: Find After .5s

[matt72lsu]

Homework Statement

A proton is released from rest at t=o in a uniform electric field whose magnitude is 2.5e-8 N/C. How far has the proton traveled after .5 s?

Homework Equations

x = vot + 1/2at^2

The Attempt at a Solution

x = 1/2(9.81)(.5)^2 = 1.2 but it says the answer is .3m. I'm prety sure I'm using the correct equation so I don't know what is wrong.

 

[pgardn]

Homework Statement

A proton is released from rest at t=o in a uniform electric field whose magnitude is 2.5e-8 N/C. How far has the proton traveled after .5 s?

Homework Equations

x = vot + 1/2at^2

The Attempt at a Solution

x = 1/2(9.81)(.5)^2 = 1.2 but it says the answer is .3m. I'm prety sure I'm using the correct equation so I don't know what is wrong.

Fe = q*E = ma Solve for acceleration, a, first. Then do your kinematics. The proton is accelerating in an electric field, I am assuming you don't have to worry about g... Have you not been studying E fields in your class? Remember what you are studying in class and then apply to the "old" ways.

 

[matt72lsu]

thanks!

 

[pgardn]

thanks!

happy day