Answer
1.5 x $10^{2}$ J
Work Step by Step
Step 1: Start with the equation for kinetic energy
KE = $\frac{1}{2}$$mv^{2}$
Step 2: Convert the units of mass and velocity
m = 5.25 oz * (1 lb/ 16 oz) * (1 kg/ 2.205 lb) = 0.149 kg
v - (1 x $10^{2}$mi/h) * (1609.3m/ 1 mi) * (1h/ 60 min) * (1 min/ 60 sec) = 45 m/s
Step 3: Plug in the values
KE = .5 * .149kg * $(45m/s)^{2}$ = 1.5 x $10^{2}$ J
