A Child in a Sled Is Moving with a Speed

Multiple Choice

A child in a sled is moving with a speed of 4.0 m/s across an iced over pond.If the total mass of the sled-child system is 85.0 kg,what magnitude of the average force is required to bring the sled to rest in 10.0 s?

A) 14 N
B) 24 N
C) 34 N
D) 44 N
E) 54 N