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
Svetach [21]
4 years ago
9

In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire pote

ntial energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball when it reaches the ground?
a) 1.2 joules
b)4.9 joules
c)2.0 joules
d)6.8 joules
Physics
1 answer:
Tanya [424]4 years ago
3 0
The correct option is: Option (C) 2.0 Joules.

Explanation:

According to law of conservation of Energy:

Initial Energy = Final Energy
KE(initial) + PE(initial) = KE(final) + PE(final) --- (1)


When in the compressed state:
KE(initial) = Initial Kinetic Energy = 0
PE(initial) = Initial Potential Energy = 2.0 J

At ground (since height is 0 with respect to ground)
KE(final) = Final Kinetic Energy
PE(final) = Final Potential Energy = 0.0 J

Plug all in (1):
(1) => KE(final) = 2.0 J (Option C)
You might be interested in
On average, how many lunar eclipses are there every year?.
tia_tia [17]

Answer:

Three lunar eclipses every year.

Explanation:

A lunar eclipse only occurs during a full Moon, when the Sun, Earth and Moon are all aligned. But despite the Moon only taking 29.5 days to orbit Earth and complete a cycle from full Moon to full Moon, there are only on average about three lunar eclipses every year.

3 0
3 years ago
If the frequency of a wave that is traveling through a medium is doubled, the _
Sonja [21]
If the wavelength is doubled, frequency is halved. The wavelength and frequency of a wave are inversely proportional to each other and both are directly proportional to the velocity of the wave.
7 0
4 years ago
Convert 9.2 km to m​
Nataly_w [17]

Answer:

9,200 m

Explanation:

1 kilometer = 1000 meters so if there is 9 kilometers then it is 9000 meters, then .2 kilometer is equal to 200 meters. Add the numbers together to get 9,200 meters

5 0
4 years ago
Help!!!<br>middle school physics ​also please explain :)
Dmitriy789 [7]

Answer:

hope its helps

good luck

8 0
3 years ago
The average velocity for a trip has a positive value. Isit
Luba_88 [7]

Answer:

Yes, it's possible.

Explanation:

The average velocity is a mean value:

Vavg=\frac{displacement}{time taken}.

during that displacement, it may occur that the acceleration would negative at any time so at that moment if the velocity goes in the same direction with the acceleration, the velocity will be negative, it may take just a few moments and then go positive again. The velocity can also take negative values if for a moment the object was going backward (opposite direction). so the average velocity only means that the major of the velocity was positive.

5 0
4 years ago
Other questions:
  • If the 140 g ball is moving horizontally at 25 m/s , and the catch is made when the ballplayer is at the highest point of his le
    6·1 answer
  • The overall length of a piccolo is 32.0 cm. The resonating air column vibrates as in a pipe that is open at both ends. (a) Find
    5·1 answer
  • Your boss tells you that she needs a decision by the end of the day about the machine you want to purchase for your new operatio
    8·2 answers
  • Estimate how much power is saved if the voltage is stepped up from 150 VV to 1500 VV and then down again, rather than simply tra
    14·1 answer
  • U need to cut down 3 trees to get about 5 kilograms of bark. About how many trees u have to cut down each year to make enough pa
    15·1 answer
  • How many meters are in a gigameter?
    8·1 answer
  • Jack and George meet in the middle of a lake while paddling in their canoes. They come to a complete stop and talk for a while.
    8·1 answer
  • Which of these stars has the coolest surface temperature?A. A starB. F starC. G starD. K star
    11·2 answers
  • How is the flow of air important in designing the shape of a car?
    13·1 answer
  • Consider states with angular momentum quantum number l = 2. in units of ħ, what is the value of l?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!