a proton travelling along is x-axis is slowed by a uniform electric field E. at x = 20.0 cm, the proton has a speed of 3.5x10^6 m/s and at 80.0 cm the speed is zero. Determine the magnitude and direction of e,

The electric field direction is toward the right

Explanation:

From the question we are told that

Initial X-co-ordinate of proton

Initial speed of Proton

Final X-co-ordinate of proton

Final speed of Proton

Generally the mass of Proton is given by

Generally the kinetic energy of the proton is mathematically given by

Generally the change in electric potential is mathematically given by

Charge on a proton

Generally the equation for magnitude of an electric field is mathematically given by

Where

Therefore

The direction of the charge is towards the right

+15-35=-20

going in opposite directions