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
Gemiola [76]
4 years ago
5

An electric vehicle starts from rest and accelerates at a rate of 2.0 m/s2 in a straight line until it reaches a speed of 20 m/s

. The vehicle then slows at a constant rate of 1.0 m/s2 until it stops. (a) How much time elapses from start to stop? (b) How far does the vehicle travel from start to stop?
Physics
1 answer:
andreyandreev [35.5K]4 years ago
7 0
<span>a. How much time elapses from start to stop
v = u + at
 20 = 0 + 2t1
 t1 = 10 sec
 
2nd phase:
v = u - at
0 = 20 - 1 x t2
t2 = 20 sec
 
total time = t1+t2 = 10 + 20 = 30 sec

b.</span><span>1st phase:
  s = ut + 1/2at^2
s1 = 0 + 1/2 x 2 x (10)^2
s1 = 100 m

</span><span>2nd phase:
By s = ut - 1/2at^2
s2 = 20 x (20) - 1/2 x 1 x (20)^2
s2 = 200 m
  total distance(s) = s1+s2 = 100 + 200 = 300 m
</span>
hope this helps
You might be interested in
During most of its lifetime, s star maintains an equilibrium size in which the inward force of gravity on each atom is balanced
frez [133]

Answer:

r_f=137493m

v=8638940m/s

Explanation:

During this process the mass M=2\times10^{30}Kg will be considered constant. We start from a radius r_i=7\times10^8m and a period T_i=30\ days=(30)(24)(60)(60)s=2592000s. The final period is T_f=0.1s.

Angular momentum <em>L</em> is conserved in this process. We can use the formula L=I\omega, where I is the momentum of inertia (which for a solid sphere is I=\frac{2mr^2}{5}) and \omega=\frac{2\pi }{T} is the angular velocity, so we can write the star's angular momentum as:

L=I\omega=\frac{2mr^2}{5}\frac{2\pi }{T}=\frac{4\pi mr^2 }{5T}

Since L_f=L_i we have:

\frac{4\pi mr_f^2 }{5T_f}=\frac{4\pi mr_i^2 }{5T_i}

Which can be simplified as:

\frac{r_f^2 }{T_f}=\frac{r_i^2 }{T_i}

Which means:

r_f=\sqrt{\frac{r_i^2 T_f}{T_i}}=r_i \sqrt{\frac{T_f}{T_i}}

Which for our values is:

r_f=r_i \sqrt{\frac{T_f}{T_i}}=(7\times10^8m) \sqrt{\frac{0.1s}{2592000s}}=137493m

And we calculate the speed of a point on the equator by dividing the final circumference over the final period:

v=\frac{C_f}{T_f}=\frac{2\pi r_f}{T_f}=\frac{2\pi (137493m)}{(0.1s)}=8638940m/s

3 0
4 years ago
How do unemployment impact on an individual's psychological well being?​
Natalija [7]

Answer:

Unemployment cause stress which ultimately has long-term physiological health effect

4 0
3 years ago
Work is done when force is applied ____________________________________________?
monitta

Answer:

D none of the above

Explanation:

mark me brainlyest pls?

6 0
3 years ago
Read 2 more answers
Anyone want to talk? whats photosynthesis
choli [55]
<h2>Answer:</h2>

<h2>Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities</h2>

<h2>MaRk mE aS braiNliest ❤️</h2>

4 0
3 years ago
Read 2 more answers
Can someone help me answer this??
Bingel [31]

Answer:

<h2>3,2 oky na dekh Lena ek bar</h2><h2>2,5</h2>
7 0
3 years ago
Other questions:
  • An unpolarized light shines on an object that is placed below a crystal. When an observer looks at the object through the crysta
    9·1 answer
  • What considerations are important in a well planned system for handling emergency situations
    8·1 answer
  • A capacitor is charged to a potential of 12.0 V and is then connected to a voltmeter having an internal resistance of 3.90 MΩ. A
    12·1 answer
  • What magnitude charge creates a 4.70 N/C electric field at a point 3.70 m away?
    14·1 answer
  • What is the difference between the way matter responses to transverse waves and a longitudinal wave
    15·1 answer
  • When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was converted into energy. Suppose anot
    14·1 answer
  • What affect does a quadrupling of the mass have a upon the acceleration of the object
    8·1 answer
  • In a photoelectric effect experiment you illuminate a metal with light of an unknown wavelength and measure the maximum kinetic
    10·1 answer
  • When does he reach the stick?
    14·1 answer
  • How 2cos theta ×sin theta is =sin2theta
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!