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. (g=10 m/s square)

Answer 1

Its Easy

Work = Potential Energy

Mass = 40+20 = 60 kg

Height = 15 m

Time = 25 sec

Work = 60*15*10

Time = 25

=> 60*15*10/25 = 360 Watt

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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