The radii of the circles I, I0, and T give an estimate of the error in your experimental values for each of the horizontal ranges. Using this estimate of uncertainty, what is the fractional uncertainty in each distance measurement? How do these uncertainties compare with the percent differences between the initial and final values of the kinetic energy, between the initial and final values of the x-component of the total momentum, and between the final y-components of the two balls?

see earlier answer

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.