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Step 1:
MASS=150 newton GRAVITY=9.8 m/s² HEIGHT=200meters
Step 2:
P.E.=mgh
step 3:
P.E.=(150n)(9.8 m/s²)(200m)
step 4:
P.E=(150n)(9.8m/s²)(200m)
P.E=(1470N)(200m)
P.E=294000 N/m
ANSWER:
294000N/m