m = 22.1 lbm, the mass
v = 8.3 mi/h, the speed
Note that
1 mi/h = (5280 ft/mi)*(1/3600 h/s) = 1.4667 ft/s
Therefore
v = 8.3*1.4667 = 12.1736 ft/s
By definition, the KE (kinetic energy) is
KE = (1/2)*m*v²
= 0.5*(22.1 lbm)*(12.1736 ft/s)²
= 1637.57 lb-ft
Because 1 lb-ft = 1.35582 J, the KE is
KE = 1637.57*1.35582 = 2220.3 J
Answer: 2220.3 J
