A spaceship moves at a speed of 0.95c away from the Earth. It shoots a star wars torpedo toward the Earth at a speed of 0.90c relative to the ship. What is the velocity of the torpedo relative to the Earth? (The direction in which the spaceship moves is the positive direction.)
A. ?0.34c
B. 0.34c
C. 0.060c
D. ?0.060c
E. 0
Answer: B
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Fill in the blank(s) with the appropriate word(s).
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A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
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