You fire a bullet into a 3 kg wooden block attached to a spring with spring constant 70 n/m. when the bullet strikes the block, the spring compresses. the bullet has a mass of 0.03 kg and strikes the block with a speed of 200 m/s. what is the speed of the block and bullet when they first start moving together?

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill