a passenger sitting near the window of a train moving with velocity 20 m/per sec sees for 10 second.a train moving with velocity 9 m/per second in opposite direction. calculate the length of the 2nd train ..
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The answer is 290m/s
The point to be understood here is window is like a point particle which has no length of it's own so the relative distance traveled will be equal to the length of the second train
V relative = 20 + 9 = 29m/s
S relative = 29 ×10 = 290m
L1 +l2 = 290
As l1 = 0 as the window is like a point this length of l2= 290m
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