An object with a mass of 21 kilograms is lifted through a distance of 7 meters. How much work is done A. 147j B.703n c.15,625N
Work = F*d = mg*d = 210 * 7 = 1470 J.
To calculate the work done, we can use the formula:
Work = Force × Distance
In this case, we have the mass of the object, which we can use to determine the force applied to lift it. The force can be calculated using the formula:
Force = Mass × Acceleration due to gravity
The acceleration due to gravity is approximately 9.8 m/s².
First, let's calculate the force applied to lift the object:
Force = 21 kg × 9.8 m/s²
Force = 205.8 N
Now that we have the force and the distance, we can calculate the work done:
Work = 205.8 N × 7 m
Work = 1440.6 J
Therefore, the work done is approximately 1440.6 joules.
So, option A. 147 J is incorrect.
Option B. 703 N is incorrect.
Option C. 15,625 N is also incorrect.