Question

work done in lifting a mass of 25 kg to a height 5 m
Take g=9.8 m/s2​

Answer 1

Explanation:

F = 25*9.8

= 245 N

s = 5m

W = F*s

= 245*5

= 1225 J

Therefore, the work done is 1225 J

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Answer 2

Given :

• Mass, m = 25 kg
• Height, h = 5 m
• Acceleration due to gravity, g = 9.8 m/s²

To find :

• Work done, W

According to the question,

We know,

➞ W = mgh

Where,

• W = Work done
• m = Mass
• g = Acceleration due to gravity
• h = Height

➞ Substituting the values,

➞ W = 25 × 9.8 × 5

➞ W = 125 × 9.8

➞ W = 1125 J

• So, the work done is 1125 Joule.

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★ Unit of work :

• The unit of work is Newton metre (Nm) or Joule (J).
• Work is scalar quantity.

★ Work done of a body depends on two factors :

• Magnitude of the force, &
• Distance through which the body moves.