A36.0 kg crate starting from rest is pulled across a floor with a constant horizontal force of 225 n. for the first 11.0 m the floor is frictionless, and for the nest 10.0 m the coefficient of friction is 0.20. what is the final speed of the crate after being pulled these 21.0 m

Final speed of the crate after being pulled these 21 m is 14.9 m/sec.

Given :

Mass = 36 kg

Horizontal Force = 225 N

For the first 11 m the floor is frictionless and for the next 10 m the coefficient of friction is 0.20.

Solution :

We know that the change in kinetic energy is,

 ---- (1)

Now,

Therefore,

Now from equation (1),

Therefore, final speed of the crate after being pulled these 21 m is 14.9 m/sec.

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increase masses, decrease separation

  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