Hela proton having an initial velvocity of 20.0i Mm/s enters a the swiform magnetic field of magnitude 0.300 T with a direc-
si in perpendicular to the proton's velocity. It leaves the
This field-filled region with velocity -20.0j Mm/s. Determine
ed (a) the direction of the magnetic field, (b) the radius of
curvature of the proton's path while in the field, (c) the
distance the proton traveled in the field, and (d) the time
interval during which the proton is in the field.

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.