A stone is dropped from a window 5m high what is its speed

In summary, the conversation discusses the determination of the speed of a stone dropped from a window 5m high. The formulas for gravitational potential energy and kinetic energy are mentioned, along with the law of conservation of energy. The formula for gravitational potential energy is height x weight, while the formula for kinetic energy is 1/2 x mass x speed^2. The conversation also mentions that weight is equal to mass x acceleration due to gravity, and that this can be used to equate the two formulas and find the speed of the stone.
  • #1
indy92
3
0
Ok this might be a simple problem but i have no idea how to do it;

A stone is dropped from a window 5m high what is its speed when it hits the ground.

I don't need answer i just need a formula or some guidence
Thanks
 
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  • #2
What does the stone have at 5m high?(what kind of energy) when dropped...this kind of energy is converted into energy a body possesses by virtue of its motion...

Law of conservation of energy
 
  • #3
at 5m it has gravitaitional potential energy and when its is dropped it is converted to kinetic energy
ive got the formula for GPE it is height x weight
and for kinetic energy its 1/2 x mass x speed^2

these might not be the right formulas as i don't have the mass
 
  • #4
But...weight= mass x accel. due to gravity...so if you equate the two you will get:
1/2 x mass x speed^2= Height x weight

1/2 x mass x speed^2=Height x mass x accel. due to gravity


do you see anything canceling out?
 
  • #5
amny thanks
i appreciate your help
 

1. What is the formula for calculating the speed of a falling object?

The formula for calculating the speed of a falling object is speed = (2 * height * gravity)^1/2, where height is the distance the object is dropped from and gravity is the acceleration due to gravity (9.8 m/s^2 on Earth).

2. How high is the window from which the stone is dropped?

The window is 5 meters high, as stated in the question.

3. What is the acceleration due to gravity on Earth?

The acceleration due to gravity on Earth is 9.8 m/s^2.

4. Does the mass of the stone affect its speed?

No, the mass of the stone does not affect its speed. The formula for calculating speed does not include mass.

5. How long will it take for the stone to reach the ground?

The time it takes for the stone to reach the ground can be calculated using the formula time = (2 * height / gravity)^1/2. However, without knowing the height or the acceleration due to gravity, it is not possible to determine the exact time it will take.

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