Question

Bart runs up a 2.5 meter high flight of stairs at a
constant speed in 4.25 seconds chasing his
adolescent gazelle. If Bart's mass is 60 kg,
determine the work he did.

Answer 1

Answer:

1470J

Explanation:

Given parameters:

Height of stairs  = 2.5m

Time taken  = 4.25s

Mass of Bart  = 60kg

Unknown:

Work done by Bart  = ?

Solution:

Work done is a function of the force acting to move a body through a distance.

    Work done  = Weight  x height

  Work done  = mass x acceleration due to gravity x height

Work done  = 60 x 9.8 x 2.5  = 1470J