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
timofeeve [1]
3 years ago
9

i throw a tennis ball straight down from the roof of a building 400 meters tall.id it leaves my hand at 10 m/s, how fast will it

be moving when it hits the ground
Physics
1 answer:
Sidana [21]3 years ago
6 0

consider the motion of the tennis ball in downward direction

Y = vertical displacement = 400 m

a = acceleration = acceleration due to gravity = 9.8 m/s²

v₀ = initial velocity of the ball at the top of building = 10 m/s

v = final velocity of the ball when it hits the ground = ?

using the kinematics equation

v² = v²₀ + 2 a Y

inserting the values

v² = 10² + 2 (9.8) (400)

v = 89.11 m/s

You might be interested in
In your own words explain efficiency
Oliga [24]
Efficiency is completing a task as fast a possible the the least amount of effort.
7 0
3 years ago
Read 2 more answers
A pogo stick has a spring with a force constant of 2.50 × 104 N/m , which can be compressed 11.2 cm. what maximum height, in met
AleksandrR [38]

Answer:

h = 36.4 cm

Explanation:

given,

spring constant = 2.5 x 10⁴ N/m

compressed distance = 11.2 cm = 0.112 m

mass of the child = 44 kg

maximum height = ?

by energy of conservation

K.E_i +P.E_i= K.E_f + P.E_f

\dfrac{1}{2}kx^2 = mgh

\dfrac{1}{2}\times 2.5 \times 10^4 \times 0.112^2 = 44\times 9.8 \times h

\dfrac{1}{2}\times 2.5 \times 10^4 \times 0.112^2 = 44\times 9.8 \times h

156.8 = 44 \times 9.8 \times h

h = \dfrac{156.8}{44 \times 9.8}

h = 0.364 m

h = 36.4 cm

7 0
3 years ago
Some thermal containers have layers of materials to keep drinks cold for as long as possible. Which design would help keep ice f
grin007 [14]
The answer is D correct me if I’m wrong
5 0
3 years ago
Read 2 more answers
Electrical energy can be transformed into other types of energy. We often experience this transformation of energy in our everyd
vitfil [10]
Well I’m not sure because you don’t have anything listed
3 0
3 years ago
An automobile having a mass of 1,000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with cons
vlada-n [284]

Answer:

v=2.02\frac{m}{s}

Explanation:

Assuming no energy lost, according to the law of conservation of energy, the kinetic energy of the automobile becomes potential energy after the crash:

K=U\\\frac{mv^2}{2}=\frac{kx^2}{2}

Here m is the automobile's mass, v is the speed of the car before impact, k is the "bumper" constant and x is the compression of the bumper due to the collision. Solving for v:

v=x\sqrt\frac{k}{m}\\v=2.63*10^{-2}m\sqrt{\frac{5.9*10^6\frac{N}{m}}{10^3kg}}\\v=2.02\frac{m}{s}

8 0
3 years ago
Other questions:
  • What are ways to stop erosion? and what are are benefits and downfalls to that method?
    11·1 answer
  • Which equation describes the sum of the vectors plotted below?
    11·2 answers
  • 3. The nervous system works together to communicate with different parts of the body and with the external environment. Spinal c
    14·2 answers
  • On a map, a measurement of 1.0 cm represents a velocity of 100 m/s. If you were to draw a vector on the map that represents 80 m
    10·1 answer
  • 22.0-kg child is riding a playground merry-go-round that is rotating at 40.0 rev/min. What centripetal force is exerted if he is
    11·1 answer
  • What's cav-ins mean?
    10·1 answer
  • Mass of 2 x 1021 number of atoms of a
    10·1 answer
  • Question 10 of 10
    14·1 answer
  • Earth orbits the sun once every
    14·1 answer
  • Sound travels through different mediums using..
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!