Question

What is the work done by a motor to lift 500 kg of a block to 10 m height?
(a) 9800 J (c) 4900 J (b) 49000 J (d) 98000 J​

Answer 1

Answer:

Given :-

• A motor is lifted 500 kg of a block to 10 m height.

To Find :-

• What is the work done by a motor.

Formula Used :-

✪ Work Done = mgh ✪

where,

• m = Mass
• g = Acceleration due to gravity
• h = Height

Solution :-

Given :

• Mass = 500 kg
• Acceleration due to gravity = 9.8 m/s²
• Height = 10 m

According to the question by using the formula we get,

➦ Work Done = 500 × 9.8 × 10

➦ Work Done = 4900 × 10

➠ Work Done = 49000 J

∴ The work done by a motor is 49000 J .

Hence, the correct options is option no (b) 49000 J .

Answer 2

Answer:

• (b) 49000 J

Explanation:

Given,

• Mass of Block, m = 500kg
• The Height, h = 10m
• Acceleration due to gravity, g = 9.8m/s²

To Find,

• The work done.

Solution,

The Work Done = mgh

• → The Work Done = 500kg × 9.8m/s² × 10m
• → The Work Done = 4900 × 10 kg m²/s²
• → The Work Done = 49000 kg m²/s²
• → The Work Done = 49000 J

Therefore,

• The work done by motor is 49000 J.

Required Answer,

• (b) 49000 J