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 121 times)

EY67

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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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Answer to Question 1

B

Answer to Question 2

D



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