Question

a coolie carries a load of 5kg on his head and walks a level road upto 100km . what is the work done by gravity?​

Answer 1

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● The work done will be zero because a coolie carries a load make an angle of 90 degree wherever the 90 degree created the work done will be zero.

Proof:

W = FS Cos Q

W = FS Cos (90°)

W = FS (0)

W = 0

Answer 2

Therefore the work done by gravity is 4905 × 10³ J or 4905 KJ.

Given:

The mass of the load = 5 kg

The distance for which the coolie walks = 100 km

To Find:

The work is done by gravity.

Solution:

The given question can be solved very easily as shown below.

Given that,

The mass of the load = m = 5 kg

The distance for which the coolie walks = s = 100 km = 100 × 10³ m

The acceleration due to gravity = g = 9.81 m/s²

Now the work done by gravity is given by,

⇒ Work done by gravity W = ( Weight of the body ) × ( distance traveled by the body )

Now weight of the body = F = mg = 5 × 9.81 = 49.05

Now the work done by gravity = W = F × s

⇒ W = 49.05 × 100 × 10³ = 4905 × 10³

Therefore the work done by gravity is 4905 × 10³ J or 4905 KJ.

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