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
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