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Q1. A luge and its rider, with the total mass of 81 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 32 m/s. Assume that they stop with a constant deceleration of 3.2 m/s2.

(a) What magnitude F is necessary for the decelerating force?

(b) What distance d do they travel as decelerating?

(d) What is F for a deceleration of 6.4 m/s2?

(e) What is d for a deceleration of 6.4 m/s2?

(f) What is W for a deceleration of 6.4 m/s2?

Q2. A 45.0kg girl is standing on a 170 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.53m/s relative to the plank.

a) What is her velocity relative to surface of ice?

b) What is the velocity of the plank relative to surface of ice?

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