An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backw

Question

An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backward just after releasing the ball? Suppose that the quarterback takes 0.30 to return to the ground after throwing the ball. How far d will he move horizontally, assuming his speed is constant?

in progress 0
Calantha 5 months 2021-09-03T06:42:05+00:00 1 Answers 78 views 0

Answers ( )

    0
    2021-09-03T06:43:26+00:00

    Answer:

    a)

    the quarterback will be moving back at speed of 0.080625 m/s

    b)

    the distance moved horizontally by the quarterback is 0.0241875 m or 2.41875 cm

    Explanation:

    Given the data in the question;

    a)

    How fast will he be moving backward just after releasing the ball?

    using conservation of momentum;

    m₁v₁ = m₂v₂

    v₂ = m₁v₁ / m₂

    where m₁ is initial mass ( 0.43 kg )

    m₂ is the final mass ( 80 kg )

    v₁ is the initial velocity  ( 15 m/s )

    v₂ is the final velocity

    so we substitute

    v₂ = ( 0.43 × 15 ) / 80

    v₂ = 6.45 / 80

    v₂ = 0.080625 m/s

    Therefore, the quarterback will be moving back at speed of 0.080625 m/s

    b) Suppose that the quarterback takes 0.30 to return to the ground after throwing the ball. How far d will he move horizontally, assuming his speed is constant?

    we make use of the relation between time, distance and speed;

    s = d/t

    d = st

    where s is the speed ( 0.080625 m/s )

    t is time ( 0.30 s )

    so we substitute

    d = 0.080625 × 0.30

    d = 0.0241875 m or 2.41875 cm

    Therefore, the distance moved horizontally by the quarterback is 0.0241875 m or 2.41875 cm

Leave an answer

Browse

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