1. A small motor runs a lift that raises a load of construction lumber of weight 800 N to a height of 85 m in 45s. Assuming that the load is lifted with constant speed, what is the minimum power the motor must produce? 2. A block of mass 0.3 kg is pushed against a spring of force constant 250 N/m and compressed a distance of 0.2 m. Assume no friction. a. How much potential energy is stored in the spring? b. After the spring is released, what will be the speed of the block