Question

a coolie places a mass of 40kg on his head and walks 10meter on a Railway platform what is the work done by him against gravitation
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Answer 1

Given

• Mass = 40 kg
• Distance = 10 m

To Find

• Work done against Gravitation

Solution

● F = ma

● Work = Force × Distance

✭ Force Applied :

→ F = ma

• F = Force = ?
• M = Mass = 40 kg
• a = Acceleration = 10 m/s²

→ F = 40 × 10

→ F = 400 N

━━━━━━━━━━━━━━━━━━━━━

✭ Work Done against Gravitation :

→ Work = Force × Distance

→ Work = 400 × 10

→ Work = 4000 J

or

→ Work = 4000/1000

→ Work = 4 KJ

Answer 2

Answer:

Given :-

• Mass = 40 kg
• Distance travelled = 10 m

To Find :-

Work done by him against gravitation

Solution :-

Firstly we will find its force

F = ma

Here,

F = Force

M = Mass

A = Acceleration

Now,

F = 40 × 10

F = 400 N

Now,

Let's find Work against gravitation

Work = Force × Distance

Work = 400 × 10

Work = 4000 J

$\sf \: Or$

W = 4000/1000 = 4 KJ