Question

A 40 kg. Child runs up a flight of stairs 4m high in 2sec. What is power?

Answer 1

mass is 40 kg

hight is 4m

acceleration due to gravity is 9.8 m/s²

therefore potential energy

mgh

40*9.8*4

1568 j

Time taken is 2s

power = energy / time

=1568/2

=784 watt

I hope it will help you please mark as brainliests answer

Answer 2

Mass is $40kg$

Height is $4m$

Acceleration due to gravity is $9.8m$

Therefore, potential energy.

$=mgh$

$=40\times 9.8\times 4$

$=1568$

Time taken is 2s

Power = Energy/time

$=\frac{1568}{2}$

$=784watt$

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