Question

A porter lifts a suitcase weighing 20 kg from the
platform and puts it on his head 2.0 m above the
platform. Calculate the work done (in J) by the
porter (g=9.8)

Answer 1

Answer:

392J

Explanation:

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Answer 2

Given

• Mass = 20 kg
• Height = 2 m
• Gravitational Acceleration = 9.8 m/s²

To Find

• Work done

Solution

● Work = Force × Displacement

● Force = ma

✭ Force Applied :

→ F = ma

→ F = 20 × 9.8

→ F = 196 N

━━━━━━━━━━━━━━━━━━━━

✭ Work Done :

→ Work = Force × Displacement

→ Work = 196 × 2

→ Work = 392 J

━━━━━━━━━━━━━━━━━━━━

Another Method!!

→ Work = Potential Energy

→ Work = mgh

→ Work = 20 × 9.8 × 2

→ Work = 392 J