00:03
Hello, in this question is we have to find velocity as well as acceleration from curves.
00:18
So we'll just treat the basic idea of how you can find acceleration and velocity when given a curve.
00:31
So let's say you have a displacement time graph.
00:34
If it is a straight line, you just find a slope at any point.
00:38
But if a graph looks something like this, how do you find, say, the velocity at b.
00:56
So let's call it b.
00:58
Velocity at b, how do you find that? you extend the line from b to meet the graph, then you draw a sufficiently long tangent to that point, then you complete the right angled triangle with this tangent so as to find a change in t as well as the change in b.
01:45
So the change in d is going to be this changing d.
02:03
So your velocity, which is the slope of the displacement time graph at that point is simply changing displacement over changing time.
02:13
So you measure this value from here to here, find a difference divide by this difference from here today.
02:21
The same applies to and you realize that since your slope is decreasing, the velocity here, here would be negative.
02:32
The same applies to an acceleration, a velocity time graph...