book Maths Puzzle Numerical Ability

I need to Simplify and express in simplest radical form.

How would I simplify

square root of 2m^2/n^3

I am really lost

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book Other Question

The combined annual cost of the U.S. and Russian space program is approximately $71 billion. The U.S. program is $19 billion less than the Russian program. What is the apporximate A rock falls from a tower that is 93.1 m high. As it is falling, its height is given by the formula h=93.1- 4.9t^2, with T in seconds. How many seconds will it take for the rock to hit the fround. (h=0)