docs(physics): correct grammar

subjects/physics/README.md

@@ -3,10 +3,12 @@
 ### Instructions
 
 Isaac Newton has forgotten his laws of physics and needs your help to animate an object on his game.
-He must use the Second Law of Motion that states, when the forces acting on an object are unbalanced, the object will accelerate.
-This acceleration is dependent upon the force that act upon the object and the object's mass.
 
-So he wants to know for an object with :
+He must use the Second Law of Motion that states, "when the forces acting on an object are unbalanced, the object will accelerate."
+
+This acceleration is dependent upon the force that acts upon the object and the object's mass.
+
+So he wants to know what the acceleration of that object is, depending on its properties:
 
 - mass of xx
 - Δv of xx
@@ -15,9 +17,18 @@ So he wants to know for an object with :
 - distance xx
 - time xx
 
-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 the string `impossible`
+Create a function named `getAcceleration` that calculates the velocity of a given object. For example:
+```js
+{
+  f: 10,
+  m: 5,
+  Δv: 100,
+  Δt: 50,
+  t:1,
+  d: 10
+}
+```
+If its not possible to calculate it, it must return the string `"impossible"`.
 
 ### Formulas
 
@@ -27,6 +38,7 @@ a = Δv/Δt
 a = 2d/t^2
 
 a = acceleration
+m = mass
 F = force
 Δv = final velocity - initial velocity
 Δt = final time - initial time
@@ -36,6 +48,6 @@ t = time
 
 ### Quote
 
-Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things
+_"Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things."_
 
 Isaac Newton