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A 4.0-kg block initially at rest is pulled to the right along a horizontal surface by...

A 4.0-kg block initially at rest is pulled to the right along a horizontal surface by a constant horizontal force of 12 N.

Find the speed of the block after it has moved 3.0 m if the surfaces in contact have a coefficient of kinetic friction of 0.17 _____.

a. 1.8 m/s

b. 3.5 m/s

c. 2.8 m/s

d. 5.3 m/s

Suppose the force is applied at an angle. At what angle should the force be applied to achieve the largest possible speed after the block has moved 3.0 m to the right ______.

a. 10.6

b. 9.6

c. 11.6

d. 12.6

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