1)A body of mass 1 kg is lifted through a height of 1m. Calculate work done? 2)A coolie lifts a box of 15 kg from the ground to a height of 2m. Calculate the work by the coolie on the box
Answers
Answer:
1)M = 1kg
h = 1m
w = ?
W = mgh
W = 1 × 9.8 × 1
W = 9.8 joule..
2) M = 15 kg
h = 2m
W = ?
w = mgh
w= 15 × 9.8 × 2
w = 294 joule
I hope it will help you
(1)
Given :
mass (m) = 1 Kg
Height (h) = 1 m
To Find :
Work done in lifting the body.
Solution :
We know,
Work Done (W) = Force (F) × Displacement (s)
Work Done (W) = mgh (where, g = Acceleration due to gravity)
Work Done (W) = 1 × 10 × 1
= 10 J
∴ The work done to lift the body of mass 1 Kg to a height of 1 m is 10 J.
(2)
Given :
Mass of the box (m) = 15 Kg
Height (h) = 2 m
To Find :
Work done by the coolie
Solution :
Work Done by the coolie = mgh
where, m = mass; g = acceleration due to gravity; h = Height
Work Done by the coolie = mgh
= 15 × 10 × 2
= 300 J
Therefore, the work done by the coolie is 300 J.