Question: If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)
Options:
392 J
196 J
588 J
784 J
Correct Answer: 196 J
Solution:
Work = m * g * h = 20 kg * 9.8 m/s² * 2 m = 392 J.
If a person lifts a 20 kg box to a height of 2 m, what is the work done against
Practice Questions
Q1
If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)
392 J
196 J
588 J
784 J
Questions & Step-by-Step Solutions
If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)
Step 1: Identify the mass of the box. In this case, the mass (m) is 20 kg.
Step 2: Identify the height the box is lifted to. Here, the height (h) is 2 m.
Step 3: Identify the acceleration due to gravity. It is given as g = 9.8 m/s².
Step 4: Use the formula for work done against gravity: Work = m * g * h.
Step 5: Substitute the values into the formula: Work = 20 kg * 9.8 m/s² * 2 m.
Step 6: Calculate the result: 20 * 9.8 * 2 = 392 J.
Step 7: Conclude that the work done against gravity is 392 Joules.
Work Done Against Gravity – Work is calculated as the product of mass, gravitational acceleration, and height. It measures the energy transferred when lifting an object against the force of gravity.
Soulshift Feedback×
On a scale of 0–10, how likely are you to recommend
The Soulshift Academy?
