Question
A racing car has a mass of 1540 kg. What is its kinetic energy if it has a speed of 110 km/h? Assume that air resistance is negligible.
Answers
Travis
Kinetic Energy (KE)=(1/2)mv^2
First convert km/hr to m/s
(110km/hr)*(1000m/1km)*(1hr/3600s) =
30.6 m/s
Plug everything into the formula
KE = (1/2)(1540kg)(30.6m/s) =
23527.78 Joules
First convert km/hr to m/s
(110km/hr)*(1000m/1km)*(1hr/3600s) =
30.6 m/s
Plug everything into the formula
KE = (1/2)(1540kg)(30.6m/s) =
23527.78 Joules
Travis
Actually, forgot to square the velocity:
KE = (1/2)(1540kg)(30.6)^2 =
720997.2 Joules
KE = (1/2)(1540kg)(30.6)^2 =
720997.2 Joules