Question

A boy mass 30Kg can go up 20 steps each of height 10cm in 20sec. Calculate the power of the boy. [g=9.8m/s²]​​

Answer 1

Given:-

• Mass of boy = 30 kg
• Height = 200 cm = 2m
• Time = 20 sec

To Find:-

• Power of the boy

Solution:-

First of all we will find the energy used:-

⇒ P.E = mgh

⇒ P.E = 30 × 9.8 × 2

⇒ P.E = 588

Now let's find the Power of the boy:-

⇒ Power = $\dfrac{P.E}{t}$

⇒ Power = $\dfrac{588}{20}$

⇒ Power = 29.4 Watt

Hence, the Power of the boy is 29.4W.

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Answer 2

Solution:-

$:\implies$ P.E = mgh

$:\implies$ P.E = 30 × 9.8 × 2

$:\implies$ P.E = 588 J

Power of the boy:-

$:\implies$ Power = $\dfrac{P.E}{t}$

$:\implies$ Power = $\dfrac{588}{20}$

$:\implies$ Power = 29.4 Watt

@${{\underline{\blue{theanuragkumar}}}}$_