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In E=hv, the units for h are Joules*seconds and units of v are seconds^-1. Multiplying these gives you Joules which is an appropriate unit for energy. In E=1/2mv^2, mass is measured in kilograms and velocity in meters per second. Joules is technically "short" for units of kg*m^2/s^2 which is what is given in this equation. Though you probably don't need to memorize this, it's useful to be able to check your work and make sure you used the correct given quantities.
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