A 2.6 kg block is attached to a horizontal rope that exerts a variable force Fx=(20−5x)N, where x is in m. The coefficient of kinetic friction between the block and the floor is 0.25. Initially the block is at rest at x = 0 m.

What is the block's speed when it has been pulled to x=1.4m?

The block's speed when it has been pulled to x=1.4m is v = 3.28 m/s

According to the work energy theorem we know that total work done is equivalent to change in kinetic energy of the system.

v = 3.28

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Speed of the block after it is pulled a distance x = 1.4 m is v = 3.28 m/s

Explanation:

As per work energy theorem we know that total work done is equal to change in kinetic energy of the system

so here we have

so we will have

true is the correct answer

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  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is