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.
Answer:
2.25×3
Step-by-step explanation:
2 1/4 is equal to 2.25. So a expression could be 2.25×3.
7.2 is the answer i hope this helps!
253.356/2.58 = 98.2
Hope this helps :)
Solución:
Después de simplificar esta ecuación, el solución es 6 x 1 o 6.
Explicación:
Para encontrar la respuesta, debemos simplificar los términos entre paréntesis.
6 x (8 + 10 - 12 + 15 - 20)
6 x (18 - 12 + 15 - 20)
6 x (6 + 15 - 20)
6 x (21 - 20)
6 x (1)
Luego te quedas con 6 x 1, o 6.