A 5-Kg Projectile Is Fired Over Level Ground with a Velocity

question 27

Multiple Choice

A 5-kg projectile is fired over level ground with a velocity of 200 m/s at an angle of 25 ° above the horizontal. Just before it hits the ground its speed is 150 m/s. Over the entire trip the change in the thermal energy of the projectile and air is:

• A) +19,000 J
• B) -19,000 J
• C) +44,000 J
• D) -44,000 J
• E) 0

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