Question

the total sum of work done for holding a 100kg object at a height of 2m above the floor for 20s is
A. 0
B. 100J
C. 200J
D. 2000J
E. 4000J

Answer 1

Answer on Question #43273 – Physics – Mechanics | Kinematics | Dynamics

the total sum of work done for holding a 100kg object at a height of 2m above the floor for 20s is

A. 0

B. 100J

C. 200J

D. 2000J

E. 4000J

Solution:

Work is defined as the product of the net force acting on a body and the distance moved in the direction of the force.

$$\text{distance} = 0 \text{ (the object is motionless)}$$ $$\text{Work} = \text{force} \cdot \text{distance} = 0$$

Answer: A. 0

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