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Traveling at an initial speed of 1.5 e 6 m/s, a proton enters a region of constant magnetic field of magnitue 1.5T. It the proton's initial velocity vector makes an angle of 30 degrees with the magnetic field, compute the proton's speed 4 seconds after entering th emagnetic field.
A. 5 e 5 m/s
B. 7.5 e 5 m/s
C. 1.5 e 6 m/s
D. 3.0 e 6 m/s
A. 5 e 5 m/s
B. 7.5 e 5 m/s
C. 1.5 e 6 m/s
D. 3.0 e 6 m/s