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Q. A person with his ear to the ground sees a huge stone strike the concrete pavement a moment later 2 sounds are heard from the impact one travels in the air and the other in concrete and they are 1.1 sconds apart how far away did the impact occur?

Q. Three crates with masses m1, m2 and m3 are connected by light ropes and sit on a frictionless surface. The crates are pulled by two forces: 1 F and 2 F oriented as in the figure, (making angles α1 and α2 with the horizontal). The system accelerates horizontally.

Sketch complete free body force diagrams for each crate. Label all forces and briefly define them.

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