Converting kinetic energy into BTUs?

1. dillonmhudson

50
1. The problem statement, all variables and given/known data
"A body whose mass is 2lb experiences an increase in velocity from 20 ft/s to 50 ft/s.
Determine the change in kinetic energy in BTUs"

2. Relevant equations
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3. The attempt at a solution

As of right now I have $$\Delta$$KE=2100 lb_m ft^2/s^2

I don't know how to change that into BTUs. I don't even know what BTUs are.
For example a joule is a kg*m/s^2, so what is a BTU in terms of pounds mass?

Thanks for any help

2. mplayer

154
You could just try converting the 2 lb. mass into kg. and the two velocities given into m/s so that solving for the change in kinetic energy would be in Joules. Should be pretty easy to find those three conversion factors.

3. dillonmhudson

50
ok, yeah i guess i could do that.
Thanks!