Question

1.if the velocity time graph of an abject is parallel to x-axis what does it mean can it be parallel to y-axis?
2. what type of motion is represent by each one of the following graphs?
3.a bus increases its speed from 36 km per hour to 54 kilometre per hour in 10 seconds .find its acceleration

Answer 1

1/if the velocity time graph of an abject is parallel to x-axis then it doesn't parallel to y axis but it is parallel to x-axis..It means the body moves with constant velocity...
2)In 1st graph speed increases with time .i.e. it's velocity is changes.It performed non uniform motion and accelerated motion
In 2nd graph the speed decrease with time..
This is non accelerated motion and non uniform motion..
3)Here u=36km/hr=. 10m/s
v=54 km/hr= 15m/s
a=?
t=10s
$a = \frac{v - u}{t}$
$a = \frac{15 - 10}{10}$
$a = \frac{5}{10}$
a=0.5 m/s^2

Answer 2

1 yes when the acceleration is zero means the object is in uniform velocity the graphs will be parallel to x axis when the time is taken on x axis or parallel to y when time is taken on y axis