A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s.

Complete Question

The complete question is shown on the first uploaded image

The value  is

Explanation:

From the question we are told that  

  The mass of the block is  

  The initial speed of the block before entering the rough section is

  The time taken is  t = 0.5 s

   The  speed with which the block leaves the rough section is  

Generally from kinematic equation

=>  

=>  

=>  

Generally the magnitude of the average frictional  force is mathematically represented as

=>  

=>    

The negative sign show that the force is acting in the opposite direction to the direction of motion of the block

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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