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A train having 60 wagons each weighing 2...

A train having `60` wagons each weighing `25` tonnes moving with a speed of `72 km//h`. If the force `10 N` per tonne, the power development is:

A

`3 xx 10^(5) W`

B

`3 xx 10^(6) W`

C

`3 xx 10^(7) W`

D

`3 xx 10^(4) W`

Text Solution

Verified by Experts

The correct Answer is:
A
Net frictional force `f = 10 xx 60 xx 25 = 15,000N`
Power `= f xx v = 15,000 xx 20 = 3 xx 10^(5) W`
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