kinematics

diff --git a/spec/calculus.md b/spec/calculus.md
index ddd9011301d70a8d9681fdb5d0c0380ffc8143db..91440e566495b233302286ee3df29c55ce79e199 100644 (file)
--- a/spec/calculus.md
+++ b/spec/calculus.md
@@ -217,13 +217,11 @@ To find stationary points of a function, substitute $x$ value of given point int
 
 $${dV \over dt} = {\operatorname{change in volume} \over \operatorname{respect to time}}$$
 
 
 $${dV \over dt} = {\operatorname{change in volume} \over \operatorname{respect to time}}$$
 

-`     |->--diff-->--| |-->--diff-->--|
-displacement    velocity    acceleration
- |--<-antidiff-<---| |--<-antidiff-<-|`
-
-**displacement $x$** - change in position  
-**velocity $v$** - change in displacement  
-**acceleration $a$** - change in velocity
+**position $x$** - distance from origin or fixed point  
+**displacement $s$** - change in position from starting point (vector)  
+**velocity $v$** - change in position with respect to time  
+**acceleration $a$** - change in velocity  
+**speed** - magnitude of velocity

 
 $$v_{\operatorname{avg}}={\Delta x \over \Delta t}={{x_2 - x_1} \over {t_2 - t_1}}$$
 $$\operatorname{speed}_{\operatorname{avg}}={\Delta v \over \Delta t}$$
 
 $$v_{\operatorname{avg}}={\Delta x \over \Delta t}={{x_2 - x_1} \over {t_2 - t_1}}$$
 $$\operatorname{speed}_{\operatorname{avg}}={\Delta v \over \Delta t}$$