Question

Translational Kinetic Energy

Answer 1

I have seen the question you have not included rotational kinetic energy of the ball to the total kinetic energy for the question (a).(\[1/2mv ^{2} + 1/2Iw ^{2}\]
[\[V=rw\] for pure rolling). Moment of inertia is\[I=(2/5)mr ^{2}\]

Hope you will figure out the rest