A solid uniform ball with a mass of 125 g is rolling without ...

[Kikoku]

A solid uniform ball with a mass of 125 g is rolling without slipping along the horizontal surface of a table with a speed of 4.5 m/s when it rolls off the edge and falls towards the floor, 1.1 m below.
 
  What is the rotational kinetic energy of the ball just before it hits the floor? A) 0.51 J
  B) 0.73 J
  C) 1.1 J
  D) 2.6 J
  E) This question cannot be answered without knowing the radius of the ball.

Question 2

A wheel having a moment of inertia of 5.00 kg  m2 starts from rest and accelerates under a constant torque of 3.00 N  m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
 
  A) 57.6 J
  B) 64.0 J
  C) 78.8 J
  D) 122 J

[Sarahjh]

Answer to Question 1

A

Answer to Question 2

A