What is the acceleration of child and sled?

Question

A child sitting on a sled is pulled by a rope along a frictionless surface. The child and the sled weigh 203 N and the horizontal force on the sled is 55 N. What is the acceleration of child and sled?

Answer 1

a = F_net / m. F_net is the horizontal force. Also, weight is 203 N = mg, so m = 203 N / 10 m/s².= 20.3 kg. Now we can get a = 55 N / 20.3 kg = 2.7 m/s².