Question

Calculate the work done to take an object of mass 20 kg to the height of 10m (EXPLAIN)​

Answer 1

Answer:

2 kilojoules

Explanation:

Given :

• Mass of the object = m = 20 kg

• Height to which the object is raised = 10 = h metres

• Acceleration due to gravity = g = 10 m/s²

To find :

• Work done = m×g×h (potential energy)

Work done = 20×10×10

Work done = 200×10

Work done = 2000 joules

The work done to lift the object to a height of 10 metres is equal to 2000 joules or 2 kilojoules

Answer 2

Answer :

Given that object of mass 20 kg is to be taken to a height of 10 m.

We have to find work done to take it to that height.

From data we have :

Mass (M) = 20 kg

Gravitational acceleration (g) = 9.8 m/s²

Height (h) = 10 m

We know that,

→ Work done (P.E.) = m × g × h. [W = mgh]

Substituting values,

→ Work done = 20 × 9.8 × 10

→ Work done = 200 × 9.8

→ Work done = 1960 J

→ Work done = 1960/1000 kj

→ Work done = 1.96 kj

Therefore,

∴ Work done to lift that object to a height of 10 m = 1960 J or 1.96 kj