1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pogonyaev
3 years ago
14

An object is falling from a height of 7.5 meters. At what height will it’s velocity be 7 meters/second?

Physics
1 answer:
Nady [450]3 years ago
6 0
One of the equations of gravity is this:
{v}^{2} = {u}^{2} + 2gh
Where v = final velocity which is 7m/s
u = initial velocity which is 0 for objects falling from a height
g = acceleration due to gravity and it is approximately 10m/s^2. It's a constant so pretty much remember this number. It's positive since the work being done is caused by gravity (in other words, it's falling down). It can also be negative if the work being down is against gravity (in other words, it's going up)
h = height of object

Substitute for the values and you should have something like this
{7}^{2} = {0}^{2} + 2 \times 10 \times h
49 = 0 + 20h
h = \frac{49}{20}
h = 2.5m
You might be interested in
What is it called when objects become positively charged when they lose electrons and negatively charged when they gain electron
Alexeev081 [22]
It is c: electric charge
4 0
3 years ago
Read 2 more answers
Radar use reflected microwaves to detect objects and measure their... what?
Sloan [31]
Height and depth..... for sure....

7 0
3 years ago
⚠️ PLEASE HELP ⚠️
Svetllana [295]

Answer:

-79.6

-80

-81.2

Explanation:

5 0
3 years ago
Read 2 more answers
A proton has been accelerated from rest through a potential difference of -1000 v . part a what is the proton's kinetic energy,
wlad13 [49]
We can apply the law of conservation of energy here. The total energy of the proton must remain constant, so the sum of the variation of electric potential energy and of kinetic energy of the proton must be zero:
\Delta U + \Delta K=0
which means
\Delta K = - \Delta U
The variation of electric potential energy is equal to the product between the charge of the proton (q=1eV) and the potential difference (\Delta V=-1000 V):
\Delta U = q \Delta V=(1 eV)(-1000 V)=-1000 eV
Therefore, the kinetic energy gained by the proton is
\Delta K = -(-1000 eV)=1000 eV
<span>And since the initial kinetic energy of the proton was zero (it started from rest), then this 1000 eV corresponds to the final kinetic energy of the proton.</span>
4 0
3 years ago
Read 2 more answers
What is Kepler’s first law?
BartSMP [9]

Answer:

Kepler's First Law: each planet's orbit about the Sun is an ellipse. The Sun's center is always located at one focus of the orbital ellipse. The Sun is at one focus. The planet follows the ellipse in its orbit, meaning that the planet to Sun distance is constantly changing as the planet goes around its orbit.

5 0
2 years ago
Read 2 more answers
Other questions:
  • A pendulum of mass 5.0 kg hangs in equilibrium. A frustrated student walks up to it and kicks the bob with a horizontal force of
    9·1 answer
  • Can someone help me with this whole page? i can't seem to figure it out. Is physics homework
    6·1 answer
  • How far will a runner travel at an average speed of 5m/s for 20 minutes?
    11·1 answer
  • A mass hanging from a vertical spring is in simple harmonic motion as given by the following position function, where t is measu
    7·1 answer
  • 3 + 2 − 4 = 3 + (2 − 4) (1 point) Group of answer choices True False
    8·1 answer
  • A wave is a disturbance that transfers energy through medium from one place to another.  Do the particles in the medium travel w
    11·1 answer
  • How much force is needed to accelerate a 1,500 kg car at a rate of 7 m/s2?
    11·1 answer
  • Which factor is not a type of spectra?
    11·1 answer
  • Louisa found that she could melt 150g of lead at 3275 C. At what temperature could she melt 75g of lead?
    5·1 answer
  • Carbon-14 is used to determine the time an organism was living. The amount of carbon-14 an organism has is constant with the atm
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!