A porter lifts a luggage of 20 kg from the ground and puts it on his head 3m above the ground. After keeping it on his head he walks 10m. Calculate the work done by him on the luggage.
Answers
Total work done in lifting and moving the luggage is 588 Joules.
Explanation:
1. work done in lifting the luggage
= potential energy of the luggage
= mgh
where,
m = mass = 20 kg
g = acc. due to gravity = 9.8 m/s²
h = height = 3 m
Hence ,
P = mgh = 20 x 9.8 x 3
= 588 J
2. work done in moving the object,
Since now weight of the luggage is acting in downward direction and the movement is in horizontal direction, hence work done in moving the luggage is zero because component of force along horizontal direction is zero
Total work done = 588 + 0 = 588 J.
Hence total work done in lifting and moving the luggage 588 J
Answer:
588joules
Explanation:
1. work done in lifting the luggage
= potential energy of the luggage
= mgh
where,
m = mass = 20 kg
g = acc. due to gravity = 9.8 m/s²
h = height = 3 m
Hence ,
P = mgh = 20 x 9.8 x 3
= 588 J
2. work done in moving the object,
Since now weight of the luggage is acting in downward direction and the movement is in horizontal direction, hence work done in moving the luggage is zero because component of force along horizontal direction is zero
Total work done = 588 + 0 = 588 J.
Hence total work done in lifting and moving the luggage 588 J