Train A is moving at 100 kmh–1 through a station. Train B is also travelling at 100 kmh–1 through the station but in the opposit
e direction to train A. What is the speed of a seated passenger on? (a) train A relative to an observer on the station? (b) train A relative to another seated passenger on the same train? (c) train B relative to a passenger on train A?
(a) An observer on the station has a speed of 0 km/h. The speed of a passenger on Train A is 100 km/h. The relative speed is 100 km/h − 0 km/h = 100 km/h.
(b) The speed of both passengers is 100 km/h, in the same direction. The relative speed is 100 km/h − 100 km/h = 0 km/h.
(c) The speed of both passengers is 100 km/h, in opposite directions. The relative speed is 100 km/h − (-100 km/h) = 200 km/h.
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Out of that list, the concave mirror is the only item that can concentrate sunlight and heat into a small area. But if you could get ahold of a convex lens, that would be even better.
