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

question 32

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)+6300 J
• B)-6300 J
• C)+44,000 J
• D)-44,000 J
• E)0 J

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