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## 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

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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?

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Physics
5 months
2021-09-03T06:42:05+00:00
2021-09-03T06:42:05+00:00 1 Answers
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## Answers ( )

Answer:a)the quarterback will be moving back at speed of

0.080625 m/sb)the distance moved horizontally by the quarterback is

0.0241875 mor2.41875 cmExplanation: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/sTherefore, the quarterback will be moving back at speed of

0.080625 m/sb)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 mor2.41875 cmTherefore, the distance moved horizontally by the quarterback is

0.0241875 mor2.41875 cm