Answer:
The kinetic energy will be 687.186 BTU
Explanation:
We have given mass of car = 2500 lbm
We know that 1 lbm = 0.4535 kg
So 2500 lbm = [tex]2500\times 0.4535=1133.75kg[/tex]
Speed = 80 mph
We know that 1 mile = 1609.34 meter
1 hour = 3600 sec
So [tex]80mph=\frac{80\times 1609.34}{3600}=35.763m/sec[/tex]
We know that kinetic energy [tex]E=\frac{1}{2}mv^2=\frac{1}{2}\times 1133.75\times 35.76^2=725.033KJ[/tex]
We know that 1 KJ = 0.9478 BTU
So 725.033 KJ = 725.033×0.9478 = 687.186 BTU
