Question

14) Below is a figure of the anterior-posterior ground reaction force for a 60 kg individual running over a force plate. If the horizontal velocity of the runner is 4.2 m/s when she first lands on the force plate, determine his velocity at: a) midstance (2 pt) b) when she just comes off the plate (2 pt) Horizontal Force (N) Braking Impulse m = 60 kg 200 F = -132.2 N 100 ?t = 0.112 s 0.05 0.10 0.15 0.20 0.25 0 -100 -200 -300 Propulsion Impulse F = 115.58 N ?t = 0.122 s Heel Strike Mid-Stance Toe-Off ay ax ay ay ax Rx Ry Rx Ry Ry

          14) Below is a figure of the anterior-posterior ground reaction force for a 60 kg individual running over a force plate. If the horizontal velocity of the runner is 4.2 m/s when she first lands on the force plate, determine his velocity at:
a) midstance (2 pt)
b) when she just comes off the plate (2 pt)

Horizontal Force (N)
Braking Impulse
m = 60 kg
200
F = -132.2 N
100
?t = 0.112 s
0.05 0.10 0.15 0.20 0.25
0
-100
-200
-300
Propulsion Impulse
F = 115.58 N
?t = 0.122 s

Heel Strike
Mid-Stance
Toe-Off

ay ax
ay
ay ax
Rx Ry
Rx Ry
Ry

14) Below is a figure of the anterior-posterior ground reaction force for a 60 kg individual running over a force plate. If the horizontal velocity of the runner is 4.2 m/s when she first lands on the force plate, determine his velocity at:
a) midstance (2 pt)
b) when she just comes off the plate (2 pt)

Horizontal Force (N)
Braking Impulse
m = 60 kg
200
F = -132.2 N
100
?t = 0.112 s
0.05 0.10 0.15 0.20 0.25
0
-100
-200
-300
Propulsion Impulse
F = 115.58 N
?t = 0.122 s

Heel Strike
Mid-Stance
Toe-Off

ay ax
ay
ay ax
Rx Ry
Rx Ry
Ry

Added by Casey O.

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