A 4-lb ball *B* is traveling around in a circle of radius *r*1 = 3 ftwith a speed (*v**B*)1 = 5.6ft/s . The attached cord is pulled down through the hole with a constant speed *v*r = 1.6ft/s .

**Part A**

Determine the ball’s speed at the instant *r*2 = 2 ft. Neglect friction and the size of the ball.

Express your answer to three significant figures and include the appropriate units.

**Part B**

How much work has to be done to pull down the cord at the instant *r*2 = 2 ft? Neglect friction and the size of the ball.

Express your answer to three significant figures and include the appropriate units.

Show transcribed image text A 4-lb ball B is traveling around in a circle of radius r1 = 3 ftwith a speed (vB)1 = 5.6ft/s . The attached cord is pulled down through the hole with a constant speed vr = 1.6ft/s . Part A Determine the ball’s speed at the instant r2 = 2 ft. Neglect friction and the size of the ball. Express your answer to three significant figures and include the appropriate units. Part B How much work has to be done to pull down the cord at the instant r2 = 2 ft? Neglect friction and the size of the ball. Express your answer to three significant figures and include the appropriate units.