An object is lifted vertically 4 m against gravity. If the mass of the object is
Practice Questions
Q1
An object is lifted vertically 4 m against gravity. If the mass of the object is 10 kg, what is the work done against gravity? (g = 9.8 m/s²)
39.2 J
78.4 J
98 J
196 J
Questions & Step-by-Step Solutions
An object is lifted vertically 4 m against gravity. If the mass of the object is 10 kg, what is the work done against gravity? (g = 9.8 m/s²)
Step 1: Identify the mass of the object. In this case, the mass (m) is 10 kg.
Step 2: Identify the height the object is lifted. Here, the height (h) is 4 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, which is W = mgh.
Step 5: Substitute the values into the formula: W = 10 kg × 9.8 m/s² × 4 m.
Step 6: Calculate the result: 10 × 9.8 = 98, then 98 × 4 = 392.
Step 7: Conclude that the work done against gravity is 392 Joules (J).
Work Done Against Gravity – The work done against gravity is calculated using the formula W = mgh, where m is mass, g is the acceleration due to gravity, and h is the height lifted.
