Suppose an automobile has a kinetic energy of 2600 J. When it moves with nine times the speed, what will be it?
DP asked:
Suppose an automobile has a kinetic energy
of 2600 J.
When it moves with nine times the speed,
what will be its kinetic energy?
Answer in units of J.
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Suppose an automobile has a kinetic energy
of 2600 J.
When it moves with nine times the speed,
what will be its kinetic energy?
Answer in units of J.
March 6th, 2010 at 12:02 pm
kinetic energy is 1/2mv^2
KE=.5mv^2
Solve this way(e1=energy 1)
(v1)^2/(v2)^2=e1/e2
(v1)^2/(v2)^2=2600/e2
(v1)^2/(9v1)^2=2600/e2 (As second velocity is 9 times the first one,second vel =9v1)
Now (v1)^2 will get cancelled
1/9=2600/e2
cross multiply and solve
Remember that the method is convention to solve such problems. Muhammad Saad H
March 6th, 2010 at 6:11 pm
Be careful, Muhammad:
1/81 = 2600/e2 prussellro