Answer:
a) 
b) 
Explanation:
Given the information from the exercise we can calculate the work done by the elevator using the following formula:

a) Considering you and your belongings as a system we know that the elevator is applying a Normal reaction force of:

Since the force applied and the displacement is in the same direction, the work done by the elevator is positive

b) The reaction force applied by the elevator is the same as the weight of the person

Since the force applied and the displacement is in opposite direction, the work done by the elevator is negative

Answer:
A: No because it is nor changing speed or direction
B: Yes because it changes direction even though the speed is constant
Please Give Brainliest
Answer:
A horse pulls a wagon along a road
Answer:
cooooooooooooooollllllllll
Explanation: