Question

A ball is projected vertically upwards with a velocity v. It comes back to ground in time t. Which v-t graph shows the motion correctly?

Answer 1

CORRECT ANSWER IS : OPTION C

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Explanation :

In the velocity time graph, velocity is taken on Y axis and time is taken on X- axis.

Let the initial velocity=u m/s
Let ' t' be the time taken to reach the maximum height h.
At maximum height, velocity becomes zero and the ball starts it's backward journey .
Here in the graph, we can see that velocity in backward journey increases but in negative direction till the stone reaches to ground.

Please refer the attachment for velocity time graph.
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Answer 2

Answer:

V-t graph=area of

triangle =1/2×120×1000/1000

=60km