Question

What is the work done to bring a mass of 3 kg above the surface of earth to a height of 5 m (Take g = 10 m/s²) a. 120 J b. 130 J c. 140 J d. 150 J

Answer 1

Answer:

d. 150 Joules

Explanation:

As per the provided information in the given question, we have :

• Mass (m) = 3 kg
• Acceleration due to gravity (g) = 10 m/s²
• Height of fall (h) = 5 m

We are asked to calculate work done to bring a mass of 3 kg above the surface of earth to a height of 5 m.

Finding potential energy :

The energy stored in the body due to its position or change in it, is the potential energy of the object. It is equal to the work done by the body.

By using the formula,

⇒ Potential energy = mgh

• m denotes mass
• g denotes acceleration due to gravity
• h denotes height

⇒ Potential energy = 3 × 10 × 5

⇒ Potential energy = 50 × 3

⇒ Potential energy = 150

We know that, Standard unit to measure potential energy is joule$.$

∴ The potential energy is 150 Joules. (Option - D)