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Q. An object weighing 349-N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 312-N. Immersed in oil; object weighs 324 N. Analyse the density of the object.

Q. A 2200kg sport utility vehicle travelling at 96 km/h can be stopped in 0.20 s if it hits a concrete wall. Suppose a 60 kg person was in the car that hit this wall. The velocity of the person equals that of the car both before and after the crash and velocity changes in 0.20 s.

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