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Author Question: A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. ... (Read 127 times)

EY67

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on: Jul 28, 2018
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
 a. -1.3 kJ
  b. -1.5 kJ
  c. -1.8 kJ
  d. -2.0 kJ
  e. -2.3 kJ

Question 2

A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
 a. -0.64 kJ
  b. -0.40 kJ
  c. -0.52 kJ
  d. -0.28 kJ
  e. -0.76 kJ


cuttiesgirl16

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Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

D


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EY67

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Reply #2 on: Jul 28, 2018
Thank you!


cuttiesgirl16

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Reply #3 on: Jul 28, 2018
Always glad to help...


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