A force of 100 N is applied to a 50-kg mass in the direction of motion for a distance of 6.0 m and then the force is increased to 150 N for the next 4.0 m. For the 10 m of travel, how much work is done by the varying force?
A、1200 J;
B、1500 J;
C、2400 J;
D、-1 500 J;
E、500 J;
F、980 J; G:3500 J
发布时间：2025-08-10 07:11:37
