A Sledge (Including Load) Weighs 5000 N

A sledge (including load) weighs 5000 N. It is pulled on level snow by a dog team exerting a horizontal force on it. The coefficient of kinetic friction between sledge and snow is 0.05. How much work is done by the dog team pulling the sledge 1000 m at constant speed?

A) 2.5 * 10⁴ J
B) 2.5 * 10⁵ J
C) 5.0 * 10⁵ J
D) 2.5*10⁶ J
E) 5.0* 10⁶ J