On the physical aspect of XT graph In XT graph, when the line in the graph starts from zero, it moves up first. When it reaches a point, it moves down again. When v reaches zero, it continues to fall below zero. When it goes up, it's a positive speed. I don't know if the zero point is turning around from time to time when I go down. If it's below zero point, it's back to the starting point and moving in another direction Compulsory one in senior one
according to
Because it's straight up and down, so
x=kt
Then v = k is obtained
x=Vt
The slope of ascending section is positive
Speed is also in the positive direction
The slope of descending section is negative
The velocity is negative
When x reaches the maximum~
Speed changes direction!