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Direction of Instantaneous Velocity

Two trains ea...

Question

Two trains each 50m long are travelling in opposite direction with velocity 10m/s and 15m/s. The time of crossing is..

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Solution

Total Dist = 100m (50 x 2)
Relative velocity of one train = 10m/s -(-15m/s) = 10+15=25m/s

Therefore time= distance/ relative velocity = 100/25 = 4 sec

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