Physics 8.5 Rotational Kinetic Energy (9 of 19) Ball Rolling Up an Incline (1 of 3)

In this video I will find the K.E.(bottom)=? K.E.(top)=? of a solid ball m=2kg rolling up a h=10m hill with v(initial)=20m/s (1 of 3).

Next video can be seen at:

[sonaljayasekara]

Dear sir, can I ask why it’s 2/5 for coefficient of I for this case?

[pranavamali]

A jee advance question can be like to find the projectile range from remaining energy i.e multi conceptual question

[solracevol]

I wish to know how you determined what the "I" is on this problem and others. I remember you saying that on a solid disc I=1/2 mR^(squared), and a point mass it is I=mR^(squared) but on a different problem with a hollow ball, and this one there is a different coefficient. Is there a table we can look up, or a method to determine? Thank you, again love your videos.

[rampratapprajapati]

DEAR SIR,
i have confusion
lost energy(friction) is not consider if there is no friction then how can be rolling?
please reply
if friction is not there then sliding will happen
so in conservation of energy equation shoud free from rotational kinetic energy.

[JoseGarcia-mrnp]

Great Example But Im lost oh how you got 104 J and 260 J. I just don't see it.

[ibrahimabulwifa]

just one question the gravity's here should be minus -9.81 ??

[teresanguyen]

How come you didn’t cancel out all the masses