Work And 2 The Work-energy Theorem Practice 2s5x67

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its

2. A 0.300-kg ball has a speed of 15.0 m/s. its kinetic energy?

What is its kinetic enery?

If it speed were doubled, what would be

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3. A mechanic pushes a 2500-kg car, moving it from rest and making it accelerate from rest to a speed v. He does 5000 J of work in the process. During this time, the car moves 25.0 m. If friction between the car and the road is what is the final speed v of the car? What horizontal force did he exert on the car? negligible,

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4. A 40.0-kg box initially at rest is pushed 5.00 m along a rough, horizontal floor with a constant applied force of 130 the work done by the applied force, N. If the coefficient of friction between the box and the floor is 0.300, find the energy loss due to friction, the work done by the normal force, the work done by gravity, the the final speed of the box. change in kinetic energy of the box, and

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5. A crate of mass 10.0-kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20.0 with the horizontal. The coefficient of kinetic friction is 0.400, How much work is done by gravity? How much energy is loss due to friction? and the crate is pulled 5.00 m. How much work is done by the 100-N force? What is the change in kinetic energy of the crate? What is the speed of the crate after it has been pulled 5.00 m?

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6. A block of mass 12.0-kg slides from rest down a frictionless 35.0 incline and is stopped by a strong spring with . The block slides 3.00 m from the point where it comes to rest against the spring. When the block comes to rest, how far has the spring been compressed?

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7. A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed . The . Utilizing energy considerations, find the coefficient of kinetic friction between the sled and the ice is distance the sled moves before it stops.

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8. A block of mass 1.6-kg is attached to a horizontal spring that has a force constant of . The spring is Calculate the speed of the block as it es through the compressed 2.0 cm and is then released from rest. if the surface is frictionless. equilibrium position

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