As measured in an earth-based frame, a proton is moving in the +x-direction at a speed of 2.30 × 108 s m/s. (a) What force (magnitude and direction) is required to produce an acceleration in the −x-direction that has magnitude 2.30 × 108 s m/s2? (b) What magnitude of acceleration does the force calculated in part (a) give to a proton that is initially at rest?
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