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
Reika [66]
3 years ago
6

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 ​m/s reaches a height of sequalsminu

s0.9tsquaredplus36t meters in t seconds. a. Determine the velocity v of the object after t seconds. b. When does the object reach its highest​ point? c. What is the height of the object at the highest​ point? d. When does the object strike the​ ground? e. With what velocity does the object strike the​ ground? f. On what intervals is the speed​ increasing?
Physics
1 answer:
Anarel [89]3 years ago
4 0

Answer:

v = -1.8t+36

20 seconds

360 m

40 seconds

36 m/s

The object speed will increase when it is coming down from its highest height.

Explanation:

s=-0.9t^2+36t

Differentiating with respect to time we get

\frac{ds}{dt}=-1.8t+36\\\Rightarrow v=-1.8t+36

a) Velocity of the object after t seconds is v = -1.8t+36

At the highest point v will be 0

0=-1.8t+36\\\Rightarrow t=\frac{-36}{-1.8}\\\Rightarrow t=20\ s

b) The object will reach the highest point after 20 seconds

s=-0.9t^2+36t\\\Rightarrow s=-0.9\times 20^2+36\times 20\\\Rightarrow s=360\ m

c) Highest point the object will reach is 360 m

s=-0.9t^2+36t\\\Rightarrow 360=-0.9t^2+36t\\\Rightarrow -0.9t^2+36t-360=0\\\Rightarrow -9t^2+360t-3600=0

\frac{-360\pm \sqrt{0}}{2\left(-9\right)}\\\Rightarrow t=20\ s

d) Time taken to strike the ground would be 20+20 = 40 seconds

[tex]v=u+at\\\Rightarrow v=0+0.9\times 2\times 20\\\Rightarrow v=36\ m/s

Acceleration will be taken as positive because the object is going down. Hence, the sign changes. 2 is multiplied because the expression is given in the form of s=ut+\frac{1}{2}at^2

e) The velocity with which the object strikes the ground will be 36 m/s

f) The speed will increase when the object has gone up and for 20 seconds and falls down for 20 seconds. The object speed will increase when it is coming down from its highest height.

You might be interested in
Newton's second law problem. The spring constant can be determined from the balance of forces in equilibrium. Suppose the spring
mario62 [17]

Answer:

K =6.697 Kg/s²

Explanation:

Given:

delta m =41 g = 0.041 kg

delta x = 6cm = 0.06m

g = 9.8 m/s²

according to the given formula

K = delta m g /delta x

K = (0.041 kg × 9.8 m/s²) / 0.06m

K =6.697 Kg/s²

6 0
3 years ago
Atom in the ground state is said to be​
koban [17]

Answer:

Ground-state atom

Explanation:

When an atom is not excited, it is in its ground-state, which we refer as "standard" or "normal" state.

(Hopefully that helped you!)

GOOD LUCK

Astrophysicist Dr. D

3 0
3 years ago
A gas heated to millions of degrees would emit
makkiz [27]

A gas heated to millions of degrees would emit mostly x-rays.

4 0
3 years ago
Where does most of earths available carbon come from
cupoosta [38]
Rocks and sediments I believe
6 0
3 years ago
Pls help will give brainliest
max2010maxim [7]

Explanation:

the correct answer is Option 5.√½gh.

hope this helps you.

5 0
2 years ago
Other questions:
  • Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How fa
    14·1 answer
  • Which of the following best describes what occurs in a fusion reaction?
    5·1 answer
  • WILL MARK BRAINLIEST!
    12·1 answer
  • A person rides a Ferris wheel that turns with constant angular velocity. Her weight is 549.0 N. At the top of the ride her appar
    5·1 answer
  • Suppose you are walking home from school. The distance from school to your is home is five kilometers. On foot,you can get home
    9·2 answers
  • Which element is magnetic?<br> Answer<br> cobalt
    5·2 answers
  • What is the kinetic energy of a 2000 kg car traveling at a speed of 30 m/s (?65 mph)?
    6·1 answer
  • How energy is converted from one form to other
    5·2 answers
  • Hi.
    11·1 answer
  • Two ropes are attached to either side of a 100.0 kg wagon as shown below. The rope on the right is pulled at an angle 40.0° rela
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!