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AP® Physics 1 & 2

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Anti-matter

APPH12-NWBTPV

A positron is the antimatter version of the electron. A positron has a mass equal to an electron, but has the opposite charge of an electron. Assume, that in a laboratory room, a positron is initially moving horizontally toward the West at a constant velocity in the Earth's gravitational field. Ignoring any other force fields, what is the direction of the positron's acceleration?

A

Up (toward the ceiling)

B

Down (toward the floor)

C

West

D

There is no gravitational force on antimatter.