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
aksik [14]
3 years ago
9

A ball is dropped from the roof of a 25-m-tall building. What is the velocity of the object when it touches the ground? Suppose

the ball is a perfect golf ball and it bounces such that the ve locity as it leaves the ground has the same magnitude but the op posite direction as the velocity with which it reached the ground How high will the ball bounce? Now suppose instead that the ball bounces back to a height of 20 m. What was the velocity with which it left the ground?
Physics
1 answer:
Wewaii [24]3 years ago
3 0

Answer:

a)  h=25m

b)  v=19.8m/sec

Explanation:

From the question we are told that:

Height h=25m

Bounce Height h'=20m

Generally the Kinematic equation is mathematically given by

V=\sqrt{2gh}\\\\V=\sqrt{2*9.81*25}

V=22.1m/sec

Therefore Height

h=\frac{V^2}{2g}\\\\h=\frac{22.1^2}{2*9.81}

h=25m

b)

Generally the Kinematic equation is mathematically given by

v^2=2ah

v^2=2*9.8*20

v=\sqrt{2*9.8*20}

v=19.8m/sec

You might be interested in
How much force is needed to accelerate a 1,500 kg car at a rate of 8 m/s2?
lesya [120]
Force = mass * acceleration = 1500kg * 8m/s²
3 0
3 years ago
A feather is dropped onto the surface of the moon. How far will the feather have fallen if it reaches the surface in 9.00 second
Natali5045456 [20]

The feather's vertical position y is determined by

y=\dfrac12g_{\text{moon}}t^2

We take the feather's starting position to be the origin, and the downward direction to be positive. Then

y=\dfrac12\left(1.63\,\dfrac{\mathrm m}{\mathrm s^2}\right)\left(9.00\,\mathrm s\right)^2=66.0\,\mathrm m

so the answer is D.

3 0
3 years ago
Blizzards and hurricanes are examples of contrasting observations evens. Truth or False
noname [10]
The correct answer should be True
7 0
3 years ago
Read 2 more answers
A toy car is placed at 0 on a number line. It moves 9 cm to the left, then 4 cm to the right, and then 6 cm to the len
MA_775_DIABLO [31]

Answer:19 cm

Explanation:

6 0
3 years ago
Read 2 more answers
40ml of Liquid A are poured into a beaker, and 40.0ml of Liquid B are poured into an identical beaker. Stirrers in each beaker a
lakkis [162]

Answer:

d

Explanation:

there is not enough information about the liquid to know the force required for each. ie. stirring a cup of water is different than stirring a cup of pudding.

7 0
2 years ago
Other questions:
  • A turtle takes 3.5 minutes to walk 18 m toward the south along a deserted highway. A truck driver stops and picks up the turtle.
    11·1 answer
  • Kevin is a major stockholder in Professional Transmission Services (PTS), a nationwide network of transmission repair shops foun
    14·1 answer
  • Taking force , length and time as fundamental quantity , find the dimensional formula for density​
    11·1 answer
  • What type of force slows you down as you slide across the floor?
    15·2 answers
  • How do you know that potassium an alkali metal is highly reactive
    5·1 answer
  • A particular car engine operates between temperatures of 440°C (inside the cylinders of the engine) and 20°C (the temperature of
    14·1 answer
  • What happens when two charged objects physically contact each other?
    11·1 answer
  • Superman ferma in 5,0 ∙10^(-3) s un treno inizialmente in corsa alla velocitá di 216km/h. Qual é l’accelerazione media del treno
    15·1 answer
  • What is the main difference between a generator and an electric motor?
    10·2 answers
  • Type the correct answer in the box. What’s the velocity of the balloon? Use . A hot-air balloon with a mass of 400 kilograms mov
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!