Solve each of them and check if it equals to 15. if you need help solving then comment
Answer:
7 seconds
Step-by-step explanation:
Ballistic motion is usually modeled in the vertical direction in US customary units by the equation h(t) = -16t^2 +v0·t +h0, where v0 and h0 are the initial velocity and height, and h(t) is the height as a function of time in seconds. For the given initial conditions, the equation of vertical motion will be ...
h(t) = -16t^2 +64t +336
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This question asks you for the value of t for which h(t) = 0. We can solve that equation by factoring.
0 = -16t^2 +64t +336
0 = t^2 -4t -21 . . . . . . . . divide by -16
0 = (t -7)(t +3) . . . . . . . factor the quadratic
t = 7 . . . . . . the positive value of t that makes the equation true
The ball will return to the ground after 7 seconds.
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<em>Additional comment</em>
A graph of the function reveals the ball reaches a maximum height of 400 feet after 2 seconds.
In metric units, the equation is h(t) = -4.9t^2 +v0·t +h0, where distances are in meters instead of feet. Time is still in seconds.
- 2.5 i
Dividing complex numbers is actually simpler than it seems. We don't start by dividing, rather we multiply the top and the bottom by the complex conjugate of the denominator. Remember that a complex number times its complex conjugate gives an entirely real number. Also, a fraction multiplied by anything in both the numerator and denominator is unchanged.
Step.1:"How many time do I have to divide"
Step 2:"Multiply"
Step 3:"subtract"
Step 4:Drop it down
Step 5:"If nessisary" Repeat
In order to convert scientific notation to standard form, just move the decimal over however many places the exponent is. In this case you move it positively (to the right) 8 places to get 175,000,000