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
Vsevolod [243]
2 years ago
15

A rock is dropped from a helght of 2.5 meters. What is its velocity when it reaches the ground?

Physics
1 answer:
Nataly_w [17]2 years ago
7 0

u=0 m/s

h=2.5m

Using kinematic eq:

{v}^{2}  -  {u}^{2}  = 2gh \\  {v}^{2}  -  {0}^{2}  = 2gh \\ v =  \sqrt{2gh}  \\ v =  \sqrt{2 \times 10 \times 2.5}  \\ v =  \sqrt{50}  \\ v = 7.07m/s

You might be interested in
What horizontal velocity should be given to a ball hanging on a 4.9 m long thread so that it slides to the height of the hanger
igomit [66]

Answer:

13 u2 = 0 – (2 × –2 m/s2 × 6 m) = 24, u = 4.9 m

Explanation:

5 0
2 years ago
Object A and object B are initially uncharged and are separated by a distance of 1 meter. Suppose 10,000 electrons are removed f
bija089 [108]

Answer:

1

Explanation:

Let's call the magnitude of the charge of 10000 electrons q.

Because A loses q, it has a net charge +q (electrons are negative; losing them creates positive charges). Conversely, B has gained q, so it has a charge of -q. The distance between them is 1 m.

By Coulomb's law, the force between them is

F_1 = \dfrac{kq \times q}{1^2}

F_1 = kq^2

When A loses an additional 10000 electrons, the charge on it becomes +2q while that on B is -2q. The distance is now 2 m.

The force is now

F_2 = \dfrac{k\times2q \times 2q}{2^2}

F_2 = \dfrac{4kq^2}{4}

F_2 = kq^2 = F_1

\dfrac{F_2}{F_1}=1

6 0
3 years ago
An influence that can deform a flexible abject or change the motion of an object with mass.​
algol13

Answer:

An influence that can deform a flexible abject or change the motion of an object with mass.​ Answer is  A force

xXxAnimexXx

7 0
3 years ago
The momentum of blue whale with a mass of 146,000 kg and a top swimming speed of 24 km/hr is kg·m/s.
Kazeer [188]

The momentum of a blue whale with a mass of 146,000 kg and a top swimming speed of 24 km/hr is kg-m/s... the answer is:1,022,000 kg*m/s

3 0
3 years ago
Which phrase best describes sir isaac newton's contributions to modern science and therefore to the industrial revolution?
MrMuchimi
Can you please give the phrases? 

But, I'll help what I can.

First, he was the first to discover gravity. He was not bonked by the head by an apple, rather he watched an apple fall from a tree before he decided to explore gravity further. 

He was also the first scientist to be knighted, which is a great honor, as you can expect. 

Newton also developed The Three Laws of Motion. They are extremely important to physics and are considered some of the foundation for physics today. 

He also discovered calculus, which is complex math that is very helpful to scientists today. 

He also discovered the color spectrum using a glass prism, a dark room and window shade with a hole in it. He was able to project the color spectrum onto a piece of paper.

Those are the few I can think of now, but hope it helps!


8 0
3 years ago
Other questions:
  • Displacement vectors of 3 m and 5 m in the same direction combine to ma
    6·1 answer
  • which of following categories of small bodies in the solar system does ceres belong to?. . . A.Dwarf Planets. B.Comets. C.Astero
    6·2 answers
  • What device is used to measure the current in a circuit
    14·1 answer
  • A 20 N force is applied to a .170kg hockey puck. What is the acceleration of the puck?
    13·1 answer
  • A hobby rocket reaches a height of 72.3 meters and lands 111 meters from the launch point
    14·1 answer
  • A gadget of mass 21.85 kg floats in space without motion. Because of some internal malfunction, the gadget violently breaks up i
    15·1 answer
  • What is the net displacement of the particle between 0 seconds and 80 seconds
    9·1 answer
  • ⚠️I need help with the last question!⚠️
    11·1 answer
  • How long does it take a 100 kg rocket to increase speed from 10
    15·1 answer
  • How did Millikan's oil drop experiment lead to quantum nature of electric charge?​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!