A 1. 0 kg block is attached to an unstretched spring of spring constant 50 n/m and released from rest from the position shown in figure 1 above. The block oscillates for a while and eventually stops moving 0. 20 m below its starting point, as shown in figure 2. What is the change in potential energy of the block-spring-earth system between figure 1 and figure 2 ?

Adult wasps sting caterpillars and inject their eggs into the caterpillars. the larvae feed on the caterpillars, leading to the death of the caterpillars. what kind of a relationship exists between the wasps and the caterpillars? a. the adult wasps are parasites to the caterpillars. b. the caterpillars are parasites to the wasps. c. the adult wasps are commensals, and the caterpillars are hosts. d. the caterpillars are commensals, and the adult wasps are hosts.