[单选题]
06.19: A 60.0-kgball of clay is tossed vcrm3fwljn//r;v c y) 0ertically in the air 1;n9wisv b;lp with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in ip nilw19 svb;;ts potential energy when it reaches its highest point?
