To give a 17-kg child a ride, two teenagers pull on a 4.0-kg sled with ropes, as

Question

To give a 17-kg child a ride, two teenagers pull on a 4.0-kg sled with ropes, as indicated in the figure (Figure 1) . Both teenagers pull with a force of 55 N at an angle of 35 ? relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N.

Part A

Find the acceleration of the sled and child.

Express your answer using two significant figures.

To give a 17-kg child a ride, two teenagers pull on a 4.0-kg sled with ropes, as indicated in the figure (Figure 1) . Both teenagers pull with a force of 55 N at an angle of 35 ? relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Part A Find the acceleration of the sled and child. Express your answer using two significant figures.

Explanation / Answer

Fnet = 2*F*cos35 - f = 2*55*0.8191 - 57 = 33.101 N

Fnet = M*a

a = Fnet/M = 33.101/(17+4) = 1.6 m/s^2

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