Physics, asked by Hunar1515, 6 hours ago

Which one of the following is not a 20th century contribution?

a) Electric trains
b) Motoricsed boats
c) Monorail
d) Supersonic aeroplanes

Answers

Answered by Ankita0406
1

Answer:

Motorised Boats

Explanation:

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Answered by varunraja2012
1

Answer:

monorail did not be invented in the 20th century

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