00:01
Okay, so here with the four equations for kinematics, of kinematics, sorry, for an object moving in one dimension, and we're asked which of the following statements must be true.
00:08
So statement a, one of the equations can solve for acceleration without regards to time.
00:12
That is true, because we have this equation here, v squared equals u squared plus 2 as.
00:17
There is no time factor here, but we can definitely solve for acceleration.
00:21
Then b, the acceleration of the object must remain constant, even if the acceleration may be zero.
00:26
That is also true.
00:27
We have no way to account for changes in acceleration.
00:30
We can account for changes in velocity because we have initial velocity u in four of the equations, but we can't account for changes in acceleration.
00:40
So acceleration must be constant even if it's zero.
00:44
And then see, only one of the equations may be used if the velocity is constant as long as the acceleration is zero.
00:50
And we can actually use two equations here.
00:53
They both boil down to the same equation if we set a to be zero.
00:57
So if velocity is constant, then u and v are the same.
01:00
Thing, so u is equal to v, so this becomes 2 u...