A 10-kg block on a rough horizontal surface is attached to a light spring (force

Question

A 10-kg block on a rough horizontal surface is attached to a light spring (force constant = 1.4 kN/m). The block is pulled 8.0 cm to the right from its equilibrium position and released from rest. The frictional force between the block and surface has a magnitude of 30 N. What is the kinetic energy of the block as it passes through its equilibrium position?

a.

4.5 J

b.

2.1 J

c.

6.9 J

d.

6.6 J

Note: The book says the correct answer is B. But every time I end up for 6.56J. Can someone walk me through the problem?

a.

4.5 J

b.

2.1 J

c.

6.9 J

d.

6.6 J

Note: The book says the correct answer is B. But every time I end up for 6.56J. Can someone walk me through the problem?

Explanation / Answer

A 10-kg block on a rough horizontal surface is attached to a light spring (force

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