A six-cylinder vertical four-stroke in-line engine has the firing order of 1-4-2-6-3-5. The length of each connecting rod is 200 mm, and the piston stroke is 100 mm. The distances between cylinders are 100 mm, 100 mm, 150 mm, 100 mm, and 100 mm as shown below:The reciprocating parts have a mass of 1 kg per cylinder and a rotational velocity of 300 rpm. Determine the unbalanced primary and secondary forces at the plane midway between cylinder 3 and 4 as the reference plane. Note: Stroke = 2 times