Which of the following is not an example of acceleration? A.) A bird, flying at a speed of 5 m/s, speeds up to 10 m/s in a constant direction of north

B.) A car travels along a straight section of highway at a constant 100 km/h

C.) A person runs at a constant 3 mi/h while turning from the north to the east

D.) A car travels along a curve while slowing down to 60 km/h from 100 km/h

This is the answer: body 1 + engine 2

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j