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
d
Physics & Space Science
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