A proton enters a region of space with speed

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential

Problem

2.0\times10^{5}\,\text{m/s}

. Within this region the electric potential decreases by 800 V over the proton’s path. A resistive force does

-2.0\times10^{-17}\,\text{J}

of work on the proton while it is in the region. What is the proton’s speed as it leaves the region? (Proton mass

1.67\times10^{-27}\,\text{kg}

, charge

+e

) (a)

4.4\times10^{5}\,\text{m/s}

(b)

3.6\times10^{5}\,\text{m/s}

(c)

4.1\times10^{5}\,\text{m/s}

(d)

2.9\times10^{5}\,\text{m/s}