A2000-lb car drives from denver (altitude: 5280 feet) to los angeles (sea level). what is its change in potential energy, in btu? g = 32.174 ft/s² provide your answer rounded to one decimal place, and make sure to include units. *
2) the velocity of an object increases by 50% (v₂=1.5 v₁). by what factor does the kinetic energy increase? *
1
4
1.5
2.25

Explanation:

Loss of potential energy

= mgh

= 2000 x 5280 x 32.174

= 339757440 ft-poundal

1 BTU = 25036.86 ft-poundal

Loss of PE in BTU

= 339757440 / 25036.86

= 13570.3 BTU.

2 ) E = 1/2 m V²

When V increases to 1.5 V

E₁ = 1/2 m( 1.5V )²

= 2.25 X 1/2 m V²

= 2.25 X E.

Kinetic energy increases by a factor of 2.25.

conservation of mass

mass before something happens = mass afterwards