Answer:
When a stone is thrown vertically upwards, it has some
initial velocity (let u). As the stone goes its velocity goes on decreasing (it is moving against the
gravity) and at the highest point i.e., maximum height) its velocity become
zero. Let the stone takes time 'f second to reach at the highest point.
After that stone begins to fall (with zero initial
velocity) and its velocity goes on increasing (since it is moving with the gravity)
and it reaches its initial point of projection with the velocity v in the same
time (with which it was thrown), So,
Here, we have taken -u because in the upward motion velocity of stone is
in upward direction and in the downward motion, the velocity is in downward
direction.
The velocity-time graph for the whole journey is shown
below
Velocity
u
0
-u
Time
0
t
2t
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