A rock is thrown straight upward with an initial velocity of 20 m/s where the downward acceleration due to gravity is -10 m/s^2. How long is

Question

A rock is thrown straight upward with an initial velocity of 20 m/s where the downward acceleration due to gravity is -10 m/s^2. How long is the ball in the air before it returns to the thrower’s hand?

in progress 0
Trúc Chi 4 months 2021-07-14T03:00:47+00:00 1 Answers 2 views 0

Answers ( )

    0
    2021-07-14T03:02:38+00:00

    Answer:

    4 seconds

    Explanation:

    Given:

    Δy = 0 m

    v₀ = 20 m/s

    a = -10 m/s²

    Find: t

    Δy = v₀ t + ½ at²

    0 m = (20 m/s) t + ½ (-10 m/s²) t²

    0 = 20t − 5t²

    0 = 5t (4 − t)

    t = 4

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )