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**1. Homework Statement**

what is the mass of a particle which travels in a circular path with a kinetic energy of 3.2 x 10 ^-19 J moving perpendicular to a 0.200t magnetic field if it has a charge of 1.6 x10 ^-19 C and the path radius is 10 cm

**2. Homework Equations**

ke= 1/2 mv^2

mv^2/r = qvB

r = mv^2/qvB = mv/qB

mv = qBr

**3. The Attempt at a Solution**

mv =qbr

mv = 1.6 x10 ^-19 C x 0.200 T x 0.1 M

mv = 3.2x 10 ^-21

i cant figure out how to seperate the mass and velocity using ke=1/2mv^2

any help is much appreciated

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