The data is collected from the middle of a weightlifting movement where an 80 kg weightlifter had +6 N horizontal and +1041 N vertical ground reaction forces acting on them. Utilize the data below and Dempter’s body segment parameters to determine the joint reaction forces in both x and y and the joint moments for the ankle, knee and hip. Show ALL work.

Location of landmarks

Landmarks	x (m)	y (m)
Hip	0.26	0.77
Knee	0.02	0.50
Ankle	0.10	0.12
Metatarsals	0.00	0.03
COP	0.00	0.00

Segmental kinematics

Segment	ax (m/s2)	ay (m/s2)	α (rad/s2)
Thigh	2.34	-1.96	0.32
Shank	1.56	-1.64	-9.39
Foot	-0.36	-0.56	-3.41

Segment Lengths

Segment	Length (m)
Thigh	0.361
Shank	0.388
Foot	0.135