Question

A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 seconds .Calculate the power.

Answer 1

As we know power=work done/time

Here work done=E.P

so E.P=MGH

AND mass=40kg+20kg(mass of box)=60kg

G=10m/s^2

H=15m T=25s

So power=60×10×15/25=320J

Answer 2

Solution :

Given Data :

Total mass = 60

{Mass of Box = 40

Mass of Boy = 20}

Time = 25 Seconds

g = 10m/s

We need to find the power

p = (f × s) / t

But before this we need to find the force.

f = m × g

f = 60 × 10

f = 600

Now, apply the value of force into equation of power

p = (f × s) / t

p = (600 × 15)/ 25

p = 9000/ 25

p = 360 w

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