What is a process that returns to its beginning and repeat it self in the same sequence

It is also known as iteration. It is used mostly in computer programming with for and for each loops in which iteration is present. In mathematics there are some "interational operations" like product and sum for eg:

The above equation describes the summation of J alike variables n times.

d is the correct answer

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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