Two forces, of magnitudes F 1 = 75.0 N and F 2 = 30.0 N , act in opposite direct

Question

Two forces, of magnitudes F1 = 75.0N  and F2 = 30.0N , act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. (Figure 1) Initially, the center of the block is at position xi = -1.00cm . At some later time, the block has moved to the right, and its center is at a new position, xf = 3.00cm .

Two forces, of magnitudes F1 = 75.0N and F2 = 30.0N , act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. (Figure 1) Initially, the center of the block is at position xi = -1.00cm . At some later time, the block has moved to the right, and its center is at a new position, xf = 3.00cm.

Explanation / Answer

1) 3 joule

2) -1.2 joule

3) 1.8 joule

4) since no other form of energy is present there so work done by all the forces = change in kinetic energy, so answer is 1.8 joule

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