Question

calculate the work done in kilo joules in lifting a mass of 20kg at steady velocity through a vertical height of 20m

Answer 1

`\huge\boxed{\sf Work\ done = 4 kJ}`

Step-by-step explanation:

Since work done is in the form of potential energy, we will use the formula of potential energy here.

We know that,

P.E. = mgh

Where,

m = mass = 20 kg

g = acceleration due to gravity = 10 m/s²

h = vertical height = 20 m

So,

Work done = mgh

Work done = (20)(10)(20)

Work done = 4000 joules

Work done = 4 kJ

`\rule[225]{225}{2}`