answer) a) here we have uncertainity
v=5.09/100*90=4.58km/h
from this we can find the range
range=904.58km/h
so range is beween 85.42 km/h to 94.58km/h
b) so for 85.42km/h
85.42km/h=85.42km/hr*0.6241mi/km=53.31mi/h
for 94.58km/hr=94.58km/hr*0.6241mi/km=59.03mi/h
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