If 100 kg Mr Halpin is coasting along to the north and he picks up his 4 kg backpack, what was his velocity before picking up his backpack if he is going 3.5 m/s to the north after picking it up?

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.