Question

a 50kg man moved 25 steps up in 20 second. find his power , if each step is 16 cm high​

Answer 1

Answer:

98 W.

Explanation:

Mass of the man = 50kg.

He moved 25 steps of 16cm high each within 20 seconds.

Here,

If one step measures 16cm.

Then, 25 steps would measure = 16*25 = 400cm or 4m

Calculating the force :

Force = m*g

• Taking g(acceleration due to gravity) = 9.8m/s²
• m(mass) = 50kg.

So, the force :

→ 50 × 9.8

→ 490N.

Work done by the man :

→ force * displacement.

Where,

• The force is 490N.
• Total displacement is 4m.

So, the work done by him is

→ 490*4

→ 1960 joules.

We know that,

Power = Work done/Time

Where,

• Work done = 1960
• Time(sec) = 20

So, the power is

→ 1960/20

→ 98 W.

Required answer : 98W

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Formula used :

• Work done = Force*total displacement.
• Power = Work/time
• Force = m*g

Units :

• Work done = J(joule)
• Power = W(watt)
• Force = N(newton)