a) a father pulls his child on a sled by pulling on a rope which is 30 degrees with the horizontal, over his shoulder with a force of 50N. Using the coefficient  of friction for steel on ice, calculate the acceleration of the sled if its mass plus the child's is 20kg, assuming that the sled is already in motion.  b) what minimum force must the father exert to start the sled moving from rest? (coefficient of kinetic friction= 0.02 , coefficient of static friction= 0.4

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can you pls help me solve this as for my understanding.. thank you so much

 

a) a father pulls his child on a sled by pulling on a rope which is 30 degrees with the horizontal, over his shoulder with a force of 50N. Using the coefficient  of friction for steel on ice, calculate the acceleration of the sled if its mass plus the child's is 20kg, assuming that the sled is already in motion. 

b) what minimum force must the father exert to start the sled moving from rest? (coefficient of kinetic friction= 0.02 , coefficient of static friction= 0.4)

 

pls also provide a diagram for a better understanding. 

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