1.3 kg block is tied to a string that is wrapped around the rim of a pulley of radius 7.2cm. The block is released from rest. Assuming the pulley is a uniform disk with a mass of 0.31 , find the speed of the block after it has fallen through a height of 0.50 m. (b)if small lead weight is attached near the rim of the pulley and this experiment is repeated, will the speed of the block increase, decrease or stay the same? Explain.