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IrinaK [193]
2 years ago
15

A 2.50-kg projectile is launched at an angle of 20.0above the horizontal with an initial speed of 100m / s from the top of a bui

lding 40 m high. If the projectile is traveling 85.0 m/ s at its maximum height of 47.0 m, how much work has been done on the projectile by air friction ?
Physics
1 answer:
Reptile [31]2 years ago
7 0

The amount of work that has been done on the projectile by air friction is 7,569.2 J.

<h3>Work done by air friction on the projectile</h3>

The work done by air friction on the projectile is calculated as follows;

W = ΔK.E

W = ¹/₂mvf² - ¹/₂mv₀²

where;

  • vf is the final velocity = 85 m/s
  • v₀ is the initial vertical velocity = 100 x sin(20) = 34.2 m/s

W = ¹/₂m(vf² - v₀²)

W = ¹/₂ x 2.5 (85² - 34.2²)

W =  7,569.2 J

Thus, the amount of work that has been done on the projectile by air friction is 7,569.2 J.

Learn more about work done here: brainly.com/question/8119756

#SPJ1

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