Kinetic Energy - Recorded CP3.1 Describe
how different
factors affect
the gravitational
potential
energy stored in
an object.
Worked Example
X
CP3.1 Recall
and use the
equation for
gravitational
A football with a mass of 0.4kg is kicked at a
speed of 20m/s. How much kinetic energy is
stored in the moving ball?

Hypothesis. why don’t you know this? i learned this stuff in like 5th grade

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