Physics, 10.09.2019 04:10 cvvalle15

Astudent at the top of building of height h throws one ball upward with the initial speed v and then throws a second ball downward with the same initial speed. how do the final speeds of the balls compare when they reach the ground?

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Answer from: tamera62

They are the same (assuming there is no air friction)

Explanation:

Take a look at the picture.

When the first ball (the one thrown upward) gets to the point marked as A, the speed will has the exact same value V but the velocity will now point downward (just like the second ball).

So if you think about it, the first ball, from point A to the ground, will behave exactly like the second ball (same initial speed, same height).

That is why the speeds will be the same when they reach the ground.

Astudent at the top of building of height h throws one ball upward with the initial speed v and then

Answer from: vsuescun10

Velocity is same

Explanation:

Case I:

When the ball throws upwards

Let the velocity of the ball as it hits the ground is V'.

Initial velocity, u = V

Final velocity, v = V'

height = h

acceleration due to gravity = g

Use third equation of motion

$v^{2}=u^{2}+2as$

By substituting the values

$V'^{2}=V^{2}+2(-g)(-h)$

$V'=\sqrt{V^{2}+2gh}$ .... (1)

Case II:

When the ball throws downwards

Let the velocity of the ball as it hits the ground is V''.

Initial velocity, u = V

Final velocity, v = V''

height = h

acceleration due to gravity = g

Use third equation of motion

$v^{2}=u^{2}+2as$

By substituting the values

$V''^{2}=V^{2}+2(-g)(-h)$

$V''=\sqrt{V^{2}+2gh}$ .... (2)

By comparing the equation (1) and equation (2), we get

V' = V''

Thus, the velocity of balls in both the cases is same as they strikes the ground.

Answer from: Quest

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )

Answer from: Quest

the bal will not change its velocity.

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Astudent at the top of building of height h throws one ball upward with the initial speed v and then...

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