A car weighing 1451 kg. is traveling at 48.0 km/hr.
How much kinetic energy does it possess?
I need the answer in Joules.
2007-11-28 05:50:25 · 4 answers · asked by nickj3315 2 in Science & Mathematics ➔ Physics
Kinetic energy is 1/2 m v^2
You have the mass; now you must convert the velocity into meters per second.
( 48.0 km / h ) ( 1 h / 3600 s ) ( 1000 m / 1 km )
Plug in the values and solve for your answer.
2007-11-28 05:53:17 · answer #1 · answered by jgoulden 7 · 0⤊ 0⤋
You have to convert km/hr to m/s because in a KE problem v is ALWAYS in meters per second. That converts to 13.3 m/s then you have to plug into KE= 1/2 mv^2 so if you plug in all your numbers you should get 257956J
2007-11-28 06:15:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
0.5 x 141 x 48.0 (squared)
gives u an answer in joules
2007-11-28 05:54:52 · answer #3 · answered by Anonymous · 0⤊ 0⤋
48km/h = 13.33m/s
Using the equation
Ek = 1/2mv²
Ek = 1/2(1451)(13.33)²
Ek = 725.5(177.69)
Ek = 128914.1J or 128.914KJ
2007-11-28 06:01:49 · answer #4 · answered by forster1000 1 · 1⤊ 0⤋