The work done in holding a mass of 50 kg at a height of 2m above the ground is
Answers
Answer: zero
Explanation:
As he is holding the mass so there will no displacement and consequently no work is done.
Answer:
980 J
Explanation:
To answer this question, we need to know about potential energy of a body under gravity.
Potential energy (P) is the energy that is stored in an object due to its position or configuration. For a body of mass m at a certain height h above earth’s surface, the potential energy is given as: P = m × g × h where g is the acceleration due to gravity.
The work done (W) in holding the mass of 50kg at a height 2m has to be equivalent to the potential energy of the mass so that the net force is balanced and the mass stays stationary.
Therefore, W = P = m × g × h
W = 50 × 2 × 9.8
W= 980 J.
Therefore 980 joules of work needs to be done to hold that mass of 50kg at 2m height.