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Q.

A person of mass 75 kg carries a block of mass 15 kg from ground to the top of a tower 10 m high in 150 sec. The person exerts a constant power throughout this duration and his power-time graph D is as shown in Figure. If  the person- carries the same object in a time 300 sec instead of 150 sec by exerting a constant power, the correct power time graph will be :

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a

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b

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c

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d

none of these

answer is A.

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Detailed Solution

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P=dWdt⇒W=∫Pdt= Area of P−t graph

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