physics

A ^9 Be nucleus containing four protons and five neutrons has a mass of 1.50×10−26 kg and is traveling vertically upward at 1.70 km/s.

If this particle suddenly enters a horizontal magnetic field of 1.25 T pointing from west to east, find the direction of its acceleration vector the instant after it enters the field.
north, east, west, or south?

If this particle suddenly enters a horizontal magnetic field of 1.25 T pointing from west to east, find the magnitude of its acceleration vector the instant after it enters the field.

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