A fat boy punched his classmate with an energy of 200J. Find the mass of the work done. Take gravity as 10m/s²
The work done can be found using the formula:
Work = Force × Distance × cos(angle)
Since the force in this case is given by the energy, we need to calculate the distance.
If the fat boy punched his classmate vertically downward, the distance is the height from the classmate's starting position to the point where their head ends up after being punched.
Let's assume this height is h.
The potential energy gained by the classmate is equal to the work done. The classmate's mass is not given, so we'll use the formula for gravitational potential energy:
Potential Energy = mass × gravity × height
200J = mass × 10m/s² × h
Rearranging the equation, we have:
mass = 200J / (10m/s² × h)
As we don't have the value of h, we cannot calculate the mass.
To find the mass of the work done, we can use the formula for work:
Work = force × distance
In this case, the force is the energy of the punch, and the distance is not given. However, we can assume that the distance traveled by the punched classmate is negligible, and that the punch can be considered as an instant action.
So, the formula can be simplified to:
Work = force × distance = force × 0 = 0 J
Therefore, the work done is 0 J, and it does not provide any information about the mass of the classmate or the force exerted.