If a 4 kg object is lifted to a height of 2 m, what is the work done against gra

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Question: If a 4 kg object is lifted to a height of 2 m, what is the work done against gravity? (2021)

Options:

Correct Answer: 80 J

Exam Year: 2021

Solution:

Work done = mass × g × height = 4 kg × 10 m/s² × 2 m = 80 J

If a 4 kg object is lifted to a height of 2 m, what is the work done against gravity? (2021)

If a 4 kg object is lifted to a height of 2 m, what is the work done against gravity? (2021)

Step 1: Identify the mass of the object. In this case, the mass is 4 kg.
Step 2: Identify the height to which the object is lifted. Here, the height is 2 m.
Step 3: Know the acceleration due to gravity (g). It is approximately 10 m/s².
Step 4: Use the formula for work done against gravity: Work done = mass × g × height.
Step 5: Substitute the values into the formula: Work done = 4 kg × 10 m/s² × 2 m.
Step 6: Calculate the result: 4 × 10 = 40, then 40 × 2 = 80.
Step 7: Conclude that the work done against gravity is 80 Joules (J).

Work Done Against Gravity – Work is calculated as the product of mass, gravitational acceleration, and height when lifting an object against gravity.