Answer:
A) s=1/2at^2
t=√(2s/a)=√(2x400)/10.0)=9.0s
B) v=at
v=10.0x9=90m/s
Please find attached pdf
Explanation:
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0.331m
wave equation: v=f λ
v=30000m/s
f=90500 Hz
λ=
λ= 0.311m