A 1.60-m-long string is under 28.0 N of tension. A pulse travels the length of t

Question

A 1.60-m-long string is under 28.0 N of tension. A pulse travels the length of the string in 53.0 ms.

What is the mass of the string(in grams)?

I followed through with some formulas:

v = sqrt(T/u)
v=(1.60m)(.053s)
v= 30.19m/s

u=T/v^2 = 27N/(30.19m/s) = .0296

u=.0296=m/L = m/(1.60m)

thus
m= (1.60m)(.0296) = .04736kg = 47.36g

but I get an error saying
"Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures."

and I've tried with the sig fig number of 3 yet I still get the wrong answer. I've tried 47.4, 47.3, 47.36, and 47. I'm running out of chances for a simple rounding error which I've rechecked. I need help please.

Explanation / Answer

                               = 49.1575 g          

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