A 41.7kg boy and a 56.4kg girl are on the surface of a frozen lake, 14.0m apart.

Question

A 41.7kg boy and a 56.4kg girl are on the surface of a frozen lake, 14.0m apart. Using a rope, the boy exerts a horizontal 4.50N force on the girl, pulling her toward him. Calculate the magnitude of the boy's acceleration.
YOU WILL GET THE POINTS IF YOUR ANSWER IS CORRECT !! A 41.7kg boy and a 56.4kg girl are on the surface of a frozen lake, 14.0m apart. Using a rope, the boy exerts a horizontal 4.50N force on the girl, pulling her toward him. Calculate the magnitude of the boy's acceleration.
YOU WILL GET THE POINTS IF YOUR ANSWER IS CORRECT !!

Explanation / Answer

The force of the boy pulling the girl is 4.50N. So the force on the boy is the same but in the opposite direction (from Newton's 3rd Law).

Rearrange F=ma to give a:

a= F/m= 4.50/41.7 = 0.1079m/s^2

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