A 1.5 rm kg block rests on top of a 7.5 rm kg block. the, Ask an Expert

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Q1. The French train is travelling at 305 km/h. When it is 350 m from a road crossing, it blows the whistle. If speed of light is 335 m/s, how many seconds after the whistle is heard at the crossing will the train cross there?

Q2. A 1.5 {rm kg} block rests on top of a 7.5 {rm kg} block. The cord and pulley have negligible mass, and there is no significant friction anywhere. What force F should be applied to bottom block so the top block accelerates to the right at 2.60 m/s^2?

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