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
musickatia [10]
3 years ago
8

the function v(t)=-9.8t+5 gives the instantaneous velocity of an object thrown upward with an initial velocity of 5 m/sec. at wh

at time t does the object start falling?
Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
3 0

Answer:

  • <u>0.5 s</u>   (using 1 significan figure since the initial velocity is given with 1 significant figure)

Explanation:

Let's see what each term in the function v (t) = - 9.8t + 5 means:

  • <u>Term: - 9.8 t </u>

        The variable t is the time

        The coffecient - 9.8 (which is negative) means that the velocity is reduced 9.8 m/s each second.

        That means that the motion is uniformly decelerated with acceleration - 9.8 m/s².

  • <u>Term + 5</u>

        The term + 5, means that the object was launched with an upward velocity of 5 m/s.

Hence the equation tells that after the object was launched upward it starts to lose speed and will reach a maximum height when the velocity is equal to zero, from which it starts falling.

So, you can calculate when the object reachs it maximum height and starts falling by making the velocity, v (t), equal to zero and solving for t. This is how you do it:

  • v (t) = 0
  • 0 = - 9.8t  + 5
  • 9.8t  = 5               remember that the units of 9.8 is m/s² and of 5 is m/s

  • t = 5 m/s / 9.8 m/s² = 0.51 s

So, the object starts fallin at 0.51 s. Since, the velocity is reported with 1 significant digit you answer should also show 1 significant digit, which means t = 0.5 s.

You might be interested in
1.)What is the only solution of 2x^2 + 8x = x^2 – 16?
Greeley [361]
If you would like to solve the equation 2 * x^2 + 8 * x = x^2 - 16, you can calculate this using the following steps:

<span>2 * x^2 + 8 * x = x^2 - 16
</span><span>2 * x^2 - x^2 + 8 * x + 16 = 0
</span>x^2 + 8 * x + 16 = 0
(x + 4) * (x + 4) = 0
x = - 4

<span>The correct result would be x = - 4.</span>
8 0
3 years ago
Read 2 more answers
Is (7,8) a solution of the equation 2x+y=6
victus00 [196]

no it is not i don’t think that adds up correctly if u do the problem

7 0
3 years ago
Read 2 more answers
Simplify the following if x = 3 &amp; y = 4:
dusya [7]
The top one is correct …..correct is correct
5 0
2 years ago
Read 2 more answers
Find 1/5 of 65 using division
lesya692 [45]
1/5- 13/65lok lollol lol lol lol
6 0
3 years ago
How to rename 4 thousands 7 hundreds
loris [4]
4 thousand and 7 hundred (4700) is as much as 47 hundreds. Just divide the given number (4700) by 100, add a word "hundreds" and you'll get the result.
3 0
2 years ago
Read 2 more answers
Other questions:
  • What is true volume of the solids
    15·1 answer
  • can anyone explain this question please - What is the standard form of the following equation? y+3=1/4x Use integers for A, B, a
    10·1 answer
  • Can anyone help me on this thanks
    12·1 answer
  • Solve:<br>p+ 7- 5= -10 - 3<br>please use an explanation so I know how to do this next time pleaasee​
    11·1 answer
  • Classify each pair of angles as Complementary, Supplementary or neither.
    5·1 answer
  • sherane rolls a standard, six-sided number cube. what is the probability of rolling a multiple of 3?​
    12·2 answers
  • Select the correct answer.
    5·1 answer
  • Find sin 90° + cos 360° + tan 0°
    5·1 answer
  • Winston-Salem is halfway between Boone and Raleigh. Burlington is halfway between Winston- Salem and Raleigh. If Boone is locate
    8·1 answer
  • K is the midpoint of a line segment JL. If JK= 6x + 7 and KL = 9x-2, find the length of JL
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!