Two cars a and b approach each other at an intersection. car a is traveling south at 20 m/s, while car b is traveling east at 17 m/s. what is the velocity of car a as described by the passengers in car b? 1. 37 m/s, eastward2. 26 m/s, 50° south of east3. 26 m/s, 40° south of west4. 26 m/s, 40° south of east5. 26 m/s, 50° south of west

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.