- #1

vkash

- 318

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**Is kinetic energy of center of mass of a system is equal to KE of of system??**

Does Kinetic energy(KE) of center of mass is equal to kinetic energy of system?

I think no...

Example take two identical particle moving with velocity v and -v. kinetic energy is [tex]mv^2[/tex] but KE of center of mass is zero>

have a look at this example.

one of the equation placed(in book) to solve this question isA block of massmis pushed towards towards a movable wedge of massnm. and height h, with a velocityv. All the surfaces are smooth. Find the minimum value ofufor which block will reach top of height.

Work done =change in Kinetic energy

[tex]-mgh=\frac{(m+nm)

**V**^2}{2}-\frac{mu^2}{2}[/tex] (v=velocity of center of mass before collision)

(where this latex code is wrong)

I think this equation is incorrect. Because final Kinetic energy can't be written as kinetic energy of center of mass.

Am I correct??

Secondly i failed to solve this question. Any hint.,