a man of mass 50kg walks up to the top of a building of height 20m above the ground level. the increase in his potential energy is?
Answers
Answer:
2000 calories or 2to3kg
Answer:
The increase in potential energy of the man is 9800 J.
Explanation:
The mass of the man, m = 50 Kg
Height of the man above ground level, h = 20 m
The acceleration due to gravity, g = 9.8 m/s
The potential energy is given by the equation, P.E = mgh
Where 'm' is the mass of the object, 'h' is the height of the object and 'g' is the acceleration due to gravity acting on the object.
The initial position of the man was on the ground. So his initial potential energy will be, P.E₁ = 0 [∵ h = 0]
The final potential energy of the man, P.E₂ = 50 × 9.8 × 20
= 9800 J
∴ Increase in potential energy, P.E = P.E₂ - P.E₁
= 9800 - 0
= 9800 J