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Surface Tension

Why does an o...

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Why does an object take same time to go up and come down? Although they travel same distance but the force of attraction should be large when it comes down, so logically it should take comparatively less time to come down than to go up (Neglect air resistance)

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Q. A stone is projected vertically up from the bottom of a water tank. Assuming no water resistance it will go up & come down in same time but if water drag is present then the time it takes to go up,

t_{u p}

and the time it takes to come down,

t_{d o w n}

Q. Why does a balloon go up when we leave it at a certain height but an apple dropped at the same height comes down? What is the force of gravity on these objects?

So it takes $\frac{u}{g}$ secs to go up, how long will it take to come down?(as mentioned there is no air)

Q. Mark the following statement is true or false.
A ball thrown vertically up takes more time to go up than to come down.

u

is initial velocity, then it takes

\frac{u}{g}

secs to go up and

\frac{u}{g}

secs to come down when there is no air.

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