changing readmes according to the students

subjects/chunky/README.md

@@ -2,8 +2,7 @@
 
 ### Instructions
 
-Create the `chunk` function that returns an array of elements
-split into groups the length of the given size.
+Create the `chunk` function which has as parameters an `array` that will be split and an `integer` which is the size that the array should be split.
 
-If array can't be split evenly,
-the final chunk will be the remaining elements.
+The function will return an array of elements divided into groups of the length of the given size.
+If the array cannot be split evenly, the final part will be the remaining elements.

subjects/index-of/README.md

@@ -4,9 +4,9 @@
 
 Create 3 functions:
 
-- `indexOf` that returns the index of the first occurence of a value
-- `lastIndexOf` that returns the index of the last occurence of a value
-- `includes` that returns true if the value was found in the array
+- `indexOf` which returns the index of the first occurence of a value and takes as arguments an array to be searched, the value to be matched, and optionally the index from where to start searching from.
+- `lastIndexOf` which works just like the previous function but returns the index of the last occurence of a value
+- `includes` which returns true if the value was found in the array
 
 > If a value is not found, the returned index is -1
 

subjects/physics/README.md

@@ -17,7 +17,7 @@ So he wants to know for an object with :
 
 whats the acceleration of that object.
 Create a function called `getAcceleration` that given an object with the values of `{ f: 10, m: 5, Δv: 100, Δt: 50, t:1, d: 10 }`
-it must calculate the acceleration. If its not possible to calculate it you must return `impossible`
+it must calculate the acceleration. If its not possible to calculate it you must return the string `impossible`
 
 ### Formulas