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# Protons are projected with an initial speed $\tau_{b}=9550 \mathrm{m} / \mathrm{s}$ into a region where a uniform electric field of magnitude $E=$ 720 $\mathrm{N} / \mathrm{C}$ is present (Fig. $\mathrm{P} 15.70 ) .$ The protons are to hit a target that lies a horizontal distance of 1.27 $\mathrm{mm}$ from the point where the protons are launched. Find (a) the two projectionangles $\theta$ that will result in a hit and (b) the total duration of flight for each of the two trajectories.

## a. $53.08^{\circ}$b. $2.21 \times 10^{-7} \mathrm{s}$

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##### Andy C.

University of Michigan - Ann Arbor

##### Aspen F.

University of Sheffield