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April 23, 2014

Homework Help: Physics kinetic energy

Posted by Aisumi on Saturday, October 30, 2010 at 2:17am.

Okay the equation for kinetic energy is = 1/2mv^2 so how would i figure this out??

If a semi-truck decreases its speed from 10 m/s to 5 m/s, its new Kinetic Energy is:

a)4 times its old Kinetic Energy
b)2 times its old Kinetic Energy
c)1/2 its old Kinetic Energy
d)1/4 its old Kinetic Energy
okay since the v is half of what it was would it be c????

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