Two forces, of magnitudes F1 = 65.0 N and F2 = 35.0 NN, act in opposite directions on a block, which sits atop a frictionless surface. Initially, the center of the block is at position xi = -6.00 cm. At some later time, the block has moved to the right, and its center is at a new position, xf = 3.00 cm.  What is the net work Wnet done on the block by the two forces? Express your answer numerically, in joules.   Determine the change Kf - Ki in the kinetic energy of the block as it moves from xi = -6.00 cm to xf = 3.00 cm. Express your answer numerically, in joules.

Principles of Physics: A Calculus-Based Text
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Chapter6: Energy Of A System
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Two forces, of magnitudes F1 = 65.0 N and F2 = 35.0 NN, act in opposite directions on a block, which sits atop a frictionless surface. Initially, the center of the block is at position xi = -6.00 cm. At some later time, the block has moved to the right, and its center is at a new position, xf = 3.00 cm. 

What is the net work Wnet done on the block by the two forces? Express your answer numerically, in joules.
 
Determine the change Kf - Ki in the kinetic energy of the block as it moves from xi = -6.00 cm to xf = 3.00 cm. Express your answer numerically, in joules.
 
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