Adog is chasing a cat toward a tree the cat has a 10 yard lead and runs at a speed of 6 yards per second. the dog runs at a speed of 8 yards per second. the tree is 30 yards away from the dog starting position. which animal will reach the tree first

This is what a calorimeter is used for simpler ex, to measure calories in food.

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