Gravitational Potential Energy: A projectile is shot straight up from the surface of Earth by means of a very powerful cannon and experiences no appreciable air resistance. If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon? (G = 6.67 × 10-11 N ? m2/kg2, the radius of Earth is 6.38 × 106 m, and Mearth = 5.97 ? 1024 kg)
A. 355 m/s
B. 505 m/s
C. 827 m/s
D. 710 m/s
E. 906 m/s
Answer: C
Physics & Space Science
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