Suppose an automobile has a kinetic energy?
Sade asked:
Suppose an automobile has a kinetic energy
of 2400 J.
When it moves with twice 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 2400 J.
When it moves with twice the speed, what
will be its kinetic energy? Answer in units of
J.
March 20th, 2010 at 8:30 pm
assuming drag and other contradictory forces remained the same, 4800J RobertG
March 22nd, 2010 at 1:50 pm
Kinetic energy = 1/2 * mv^2
in this case, everything is the same except for the speed.
you will see once you plug in 2v into the equation at the top it will turn out to be 1/2 * m(2v)^2 = 1/2 * 4 * mv^2
doubling the speed will result in 2^2 = 4 times increase in KE.
Answer is 2400 *4 = 9600J David W
March 24th, 2010 at 12:07 pm
The kinetic energy is proportional to the velocity squared. If you double the velocity, the kinetic energy is multipled by 4
New kinetic energy = 4*2400 = 9600J Trevor H