a rock with a mass of 8kg falls from a height of 7m what work was done
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To calculate the work done, we need to use the formula:
Work = force x distance
In this case, the force is the gravitational force acting on the rock due to its weight, and the distance is the height from which the rock falls.
The gravitational force (F) can be calculated using the formula:
F = mass x gravity
Where mass is given as 8kg, and gravity is the acceleration due to gravity, which is approximately 9.8 m/s².
So, F = 8kg x 9.8 m/s² = 78.4 N
Now, we can calculate the work done:
Work = force x distance
Work = 78.4 N x 7m = 548.8 Joules
Therefore, the work done in this scenario is 548.8 Joules.