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题:一架电梯以恒定的速率v_1运送乘客上楼,某人第一次站在电梯上不动,第二次以相对电梯的速率v_2匀速上走,两次电梯运客人所做的功分别为W_1和W_2,牵引力功率为P_1和P_2,则正确的关系是:
Problem: An elevator transports passengers upstairs at a constant rate v_1. Someone stands on the elevator for the first time. The second time the elevator moves at a constant rate v_2 relative to the elevator. For W_1 and W_2, the traction power is P_1 and P_2. The correct relationship is: