A 45.4 kg girl is standing on a 144 kg plank. the plank at, Ask an Expert

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Q1. A 45.4 kg girl is standing on a 144 kg plank. The plank, at first 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 1.60 m/s relative to the plank. What is her velocity relative to the surface of ice? What is velocity of the plank relative to the surface of ice?

Q2. A CD player uses a laser whose light frequency is 3.85 × 10^14 Hz. compute the energy (in joules) of photons?

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