Final answer:
The amount of work done by the teacher to push the 98 N desk across the floor for a distance of 5 meters in 4 seconds is 490 J.
Step-by-step explanation:
The work done can be calculated using the formula:
Work = force x distance
Given that the force applied was 98 N and the distance covered was 5 meters, we can substitute these values into the formula: Work = 98 N x 5 m = 490 J
So, the amount of work done by the teacher to push the 98 N desk across the floor for a distance of 5 meters in 4 seconds is 490 J.