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
Cerrena [4.2K]
3 years ago
12

A ball is dropped from a height of 20 meters. At what height does the ball have a velocity of 10 meters/second?

Physics
1 answer:
borishaifa [10]3 years ago
6 0

Answer:B

Explanation:

Initial velocity, u=0m/s

Distance,s=20m

a=+g=9.8m/s*s

Using v*v=u*u+2gs

v*v=0+2*9.8*20

v*v=392

v=19.8

When s=20m, v = 19.8m/s

Therefore when v = 10m/s, s= 10*20/19.8

s =10.1m

You might be interested in
When a solid object is dropped
Helen [10]

Answer:

A. Archinedes

Explanation:

Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force equal to the weight of the displaced fluid. This is a first condition of equilibrium.

7 0
1 year ago
Read 2 more answers
HELP!!!!!! PLEASE!! I WILL GIVE 25 POINTS!!!!
Zolol [24]

3 is B my dude and the reason nobody answered is because thousands of questions are asked every day. So not every question can be answered. It doesn't have to do with being lazy.  

8 0
3 years ago
Read 2 more answers
Two representative elements are in the same period of the periodic table. Which statement correctly describes the atoms of the t
oksian1 [2.3K]

Elements in the periodic table are arranged in the increasing order of their atomic number.

An atom will contain equal amount of protons and electrons. If two elements are in same period of periodic table then these elements will have same number of electrons.

Helium is one of the seven elements which are called as noble gases. This gas is odorless, tasteless and colorless which makes it unique from other elements.

It has two valence electrons while atoms of other elements in the group have 8 valence electrons.

Lithium has one valence electron, while calcium atom has 2 valence electrons.

The highest level of energy is due valence electrons of an atom.  The correct answer is Lithium.

Fluorine element has 9 electrons. There are 2 electrons in the first energy level and seven electrons in the second energy level.

Learn more at brainly.com/question/24373385

7 0
3 years ago
A baseball rolls off of a .7 m high desk and strikes the floor .25 m always how fast was the ball rolling
labwork [276]

Answer:

the ball's velocity was approximately 0.66 m/s

Explanation:

Recall that we can study the motion of the baseball rolling off the table in vertical component and horizontal component separately.

Since the velocity at which the ball was rolling is entirely in the horizontal direction, it doesn't affect the vertical motion that can therefore be studied as a free fall, where only the constant acceleration of gravity is affecting the vertical movement.

Then, considering that the ball, as it falls covers a vertical distance of 0.7 meters to the ground, we can set the equation of motion for this, and estimate the time the ball was in the air:

0.7 = (1/2) g t^2

solve for t:

t^2 = 1.4 / g

t = 0.3779  sec

which we can round to about 0.38 seconds

No we use this time in the horizontal motion, which is only determined by the ball's initial velocity (vi) as it takes off:

horizontal distance covered = vi * t

0.25 = vi * (0.38)

solve for vi:

vi = 0.25/0.38  m/s

vi = 0.65798  m/s

Then the ball's velocity was approximately 0.66 m/s

4 0
2 years ago
NEED HELP
ch4aika [34]

Answer: C.

Explanation:

Just took quiz

8 0
3 years ago
Other questions:
  • describe the coordinate system that is usually chosen for analyzing circular motion and state at least one advantages for this c
    7·1 answer
  • The weight of an object on Earth is determined by
    11·1 answer
  • What force would have to win out in order for the Big Crunch to occur?
    13·1 answer
  • Five moles of an ideal monatomic gas with an initial temperature of 127∘C expand and, in the process, absorb 1500 J of heat and
    12·1 answer
  • A woman on a motorcycle moving uniformly at a rate of 20 m/s passes a truck at rest. At the instant the motorcycle passes the tr
    13·1 answer
  • What are the units for the spring constant, k?
    13·2 answers
  • Would you expect the two species to compete for food on this island? Support your answer with an explanation.
    13·2 answers
  • A conveyor belt at a recycling plant launches bottles and bottle caps into the air, so that an automatic image recognition devic
    14·1 answer
  • Question 1 of 12
    8·1 answer
  • Consider the surface with parametric equations .
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!