80 railway wagons all of same mass 5 × 10 3 kg are pulled by an engine with a force of 4 × 10 5 N . The tension in the coupling between 30 th and 31 st wagon from the engine is

Question

80 railway wagons all of same mass 5 × 10 3 kg are pulled by an engine with a force of 4 × 10 5 N . The tension in the coupling between 30 th and 31 st wagon from the engine is, 25 × 10 4 N, 40 × 10 4 N, 20 × 10 4 N, 32 × 10 4 N

MARKS App · Accepted Answer

Railway waygons to be pulled = 80 - 30 = 50 ∴ m = 50 × 5 × 10 3 kg a = F 80 M = 4 × 10 5 80 × 5 × 10 3 ⇒ F 30 = 50 × 5 × 10 3 × 4 × 10 5 80 × 5 × 10 3 = 25 × 10 4 N

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