My daughter showed me a question: Car A and B have equal mass and go up a hill. A has twice the constant velocity of B. Compared to B the power of A is? I found these answers here which seem to miss the point: https://answers.yahoo.com/question/index?qid=20070331204221AAtxncN The answer stated is 2x However, the KE is 4x greater for car A than B. Also, the time for car A to go up is 1/2 that of B because of the doubled velocity. Since Power is work/time shouldn't the power of A be 8x greater than B?