Question

Who has given Anthe (Class 10)???


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Answer 1

Solution:

The, correct option is (2)

Now, here it is given that surface is smoothless.

Means, thir is no loss in kinetic energy in ball by friction.

Ball only losses it's kinetic energy (velocity) by gravitational force by earth on going at point B from ground.
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Then, in option 2
ha > hb
means, ball accelerate for more time.[it's velocity is increasing countinuosly After he reach ground for a instant its acceleration=0]

Now, in upward path (hb) the height is low as compare to ha.
Thus,
v = u if ha = hb

But, here ha > hb so, v > u

Hope you get it.
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Answer 2

The, correct option is (2)

Now, here it is given that surface is smoothless.

Means, thir is no loss in kinetic energy in ball by friction.

Ball only losses it's kinetic energy (velocity) by gravitational force by earth on going at point B from ground.
------------------
Then, in option 2
ha > hb
means, ball accelerate for more time.[it's velocity is increasing countinuosly After he reach ground for a instant its acceleration=0]

Now, in upward path (hb) the height is low as compare to ha.
Thus,
v = u if ha = hb

But, here ha > hb so, v > u

Hope you get it.

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