Math000

The height (in meters) of a projectile shot vertically upward from a point 3 m above ground level with an initial velocity of 21.5 m/s is
h = 3 + 21.5t − 4.9t2
after t seconds. (Round your answers to two decimal places.)
(a) Find the velocity after 2 s and after 4 s.
v(2) = m/s
v(4) = m/s


(b) When does the projectile reach its maximum height?
s

(c) What is the maximum height?
m

(d) When does it hit the ground?
s

(e) With what velocity does it hit the ground?
m/s

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  1. The height (in meters) of a projectile shot vertically upward from a point 4 m above ground level with an initial velocity of 21.5 m/s is
    h = 4 + 21.5t − 4.9t2
    after t seconds. (Round your answers to two decimal places.)
    (a) Find the velocity after 2 s and after 4 s.
    v(2) =
    1.9
    m/s
    v(4) =
    -17.7
    m/s


    (b) When does the projectile reach its maximum height?

    2.19
    s

    (c) What is the maximum height?

    27.58
    m

    (d) When does it hit the ground?

    109.64
    s

    (e) With what velocity does it hit the ground?

    m/s

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