2 and measure range is 129.7 assume the energy lost was entirely due to the friction in the pipe and that the total length of the PVC pipe is 1 meter....

( I attached the picture ) predicted range is 160.2 and measure range is 129.7 assume the energy lost was entirely due to the friction in the pipe and that the total length of the PVC pipe is 1 meter. use this length to compute the average force of friction felt by the ball as it rolls down the pipe