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Answer:
d. About 112 meters.
Explanation:
From the question, John's displacement forms a right angle triangle as below.
Using Pythagoras theorem,
a² = b²+c²....................... Equation 1
Where a = John's displacement from the starting point, b = 100 m, c = 50 m
Substitite these values into equation 1
a² = 100²+50²
a² = 10000+2500
a² = 12500
a = √12500
a = 111.8 meters.
a = about 112 meters.
The right answer is d. About 112 meters.