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A luge and its rider, with a total mass of 86 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 40 m/s. Assume that they stop with a constant deceleration of 2.3 m/s2.
(a) What magnitude F is required for the decelerating force?
(b) What distance d do they travel while decelerating?
(c) What work W is done on them by the decelerating force?
(d) What is F for a deceleration of 4.6 m/s2?
(e) What is d for a deceleration of 4.6 m/s2?
(f) What is W for a deceleration of 4.6 m/s2?
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A firefighter on the back of the fire engine hears the sound waves after they are reflected from the wall. What is the frequency of this reflected wave as heard by this firefighter
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