Question

A man lifts a brick of mass 8kg from the floor to a shelf 2m high.how much work is done?​

Answer 1

Answer:

160 Joules

Explanation:

Given:

• Mass of the brick = m = 8 kg
• Height to which the brick is lifted = h = 2 metres
• acceleration due to gravity = g = 10 m/s²

To find:

• Work done

Work done = potential energy

Potential energy = Mass×Acceleration due to gravity ×height

Substituting the values:

Potential energy = 8×10×2

Potential energy = 80×2

Potential energy = 160 Joules

The work done is equal to 160 joules

Answer 2

Given ,

Mass (m) = 8 kg

Height (h) = 2 m

We know that ,

Work done = Energy

And

Potential energy = mgh

Thus ,

Potential energy = 8 × 10 × 2

Potential energy = 160 J

$\sf \therefore \underline{The \: work \: done \: is \: 160 \: J}$