Question

A man lifts a load of 20 kg Frome The ground And put it on his head 1.4m above the ground . Calculate the work done by the man

Answer 1

Answer:

• Work done in lifting load is 274.4 Joules against the gravity.

Solution:

Given

• Mass of load, m = 20 kg
• Load is lifted from Ground
• Height to which load is lifted, h = 1.4 m from ground
• Let, us take acceleration due to gravity, g = -9.8 m/s²

( Negative g because work is done against the gravity )

To find

• Work done by Man, W =?

Solution

Since,

Work done would be equal to the potential energy gained on lifting the load

→ Work done = Potential energy gained

→ Work done = m g h

[ where m is mass, g is acceleration due to gravity, h is height ]

→ Work done = ( 20 ) × ( -9.8 ) × ( 1.4 )

→ Work done = -274.4 J

Therefore,

• Work done in lifting the load is 274.4 Joules against the gravity.

Answer 2

Answer:

work done= FORCE * DISPLACEMENT

multiply the weight of the load with 1.4m ...

you will get your answer.

don't forget to put the units correctly

Explanation