Question

1. A boy of mass 50 kg can climb a mountain of height 30m in 5 minute. What
will be his power? (300w, 5w, 3000w, 50)​

Answer 1

$\sf{Power = \dfrac{Work \: Done}{Time} }$

$\sf{Power = \dfrac{mgh}{t} }$

$\sf{Power = \dfrac{50 \times 10 \times 30}{5 \times 60} = \boxed{\sf{50W}}}$

Answer 2

Answer:

The power of the boy is 50W.

Explanation:

Power is defined as the energy required per unit of time.

$P=\frac{E}{t}$          (1)

Where,

P=power required to perform work

E=energy required by the body

t=time during which energy is present

From the question we have,

M=50kg

t=5min=5×60=300s

Height(h)=30m

Here in this question, the energy will be in terms of potential energy. i.e.

$E=Mgh$     (2)

g=acceleration due to gravity=10m/s²

By substituting the value of M,g, and h in equation (2) we get;

$E=50\times 10\times 30=15000J$ (3)

By substituting the value of E and t in equation (1) we get;

$P=\frac{15000}{300}=50W$

Hence, the power required by the boy for climbing will be 50W.