Solve Numerical Problem: Proton Mass, Charge, Speed & Electric Field Strength

[Samia qureshi]

A Proton Of Mass 1.67*10^-27kg And Charge 1.6*10^-19c Moving At An Initial Speed 3*10^6m/s Against A Uniform Electric Field Has Its Speed Reduced By 50% After Covering A Distance Of 1.0cm In The Field. Determine The Strength Of The Field? ‪help me solve this problem what formula should i use to solve it.

 

[Irene Kaminkowa]

what formula should i use to solve it

Newton's Second Law of Motion

 

[Delta2]

The work-energy theorem can be used also to solve this.

 

[Samia qureshi]

can't we use F=K[q1][q2]/r^2 ?

 

[Said Ahmad]

I think it's easier to use work-energy theorem

 

[Samia qureshi]

I think it's easier to use work-energy theorem

i will try this also Thank you :)