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# Practice_5 - Practice 5(chapter 1-14 1 IfA=12i16jandB=24i...

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Practice 5 (chapter 1-14) 1. If  A  = 12 – 16 j  and  B  = –24 + 10 j , what is the magnitude of the vector  B A C - = 2 ? a. 42 b. 22 c. 64 d. 90 e. 13 2. 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? a. 25.3 m b. 29.6 m c. 27.4 m d. 23.6 m e. 18.9 m 3. If  F  = 4.0 N and  m  = 2.0 kg, what is the magnitude  a  of the acceleration for the block  shown below? The surface is frictionless.

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