2 years ago

How many stars has been observed by Hubble telescope till now ?

Physics

1 answer:

Hoochie [10]2 years ago

8 0

Answer:

More Than 1.3 million.

Hope it helps :))

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Explanation:

When the ball its thrown up, at half way of its flight it means half of its vertical height which is $\frac{h}{2}$ .

potential energy = mgh

since it moved half way of height

P.E = $\frac{mgh}{2}$

This means for the body to have gained half of its P.E, it will loose half of its kinetic energy.

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kinetic energy = $\frac{1}{2}mv^{2}$

let the final velocity at halfway flight be v1

$E_{1}$ = E/2

$\frac{1}{2}mv_{1}^{2}$ = $\frac{\frac{1}{2}mv^{2}}{2}$

cross multiply we have

$mv_{1}^{2}$ = $\frac{1}{2}mv^{2}$

cancel m from both sides

$v_{1}^{2}$ = $\frac{1}{2}v^{2}$

take the square root of both sides,

$v_{1} =\sqrt{\frac{v^{2} }{2} }$

$v_{1} =\frac{v}{\sqrt{2} }$

Thus our final velocities will be E/2 and $\frac{v}{\sqrt{2} }$

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