Answer:
The correct answer is 55m / s
Step-by-step explanation:
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Let's solve this!
The formula for calculating speed is:
v = (x2-x1) / (t2-t1)
The data we have are:
x2 = 55mm * (1m / 1000mm) = 0.055
x1 = 0m
t2 = 10.5ms * (1s / 1000ms) = 0.0105s
t1 = 9.5ms * (1s / 1000ms) = 0.0095s
v = (0.055m) / (0.0105s-0.0095s) = 55m / s
The correct answer is 55m / s