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Q. An object is placed in front of a concave mirror, 23.0 cm from the mirror's focal point. The image formed by the mirror is three times farther away from the focal point. Calculate the focal length of the mirror.

Q. In a head-on, inelastic collision, a 4000 kg truck going 10 m/s east strikes a 1000 kg car going 20 m/s west.
(a) What are the speed and the direction of the wreckage?
(b) How much kinetic energy is lost in the collision?

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Category:- Physics
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