When we want to compare two quantities a and b, but both are measured quantities such that neither can be considered to be an exact value, we use a "percent difference." percent difference is calculated by taking the absolute value of the difference of the values divided by their average multiplied by 100, or a-b % difference = 100% for example, in a measurement where no calibrated speedometer is present, we measure two values of speed, ua-10.0 m/s ± 1.1 m/s and = 12.0 m/s ± 1.3 m/s. calculate the percent difference of the two speeds above.

Is it b the answer and yes

If football was tossed in air without gravity or friction the ball would go into space

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