The answer is 6. T<span>his one is tricky if you're rounding to the nearest tenth. You have 9 in the tenth's place and you look at the number to the right which is 8. 8 is near 10, so you round the 9 to a 10, but you can't make the final answer 5.10. That's impossible so instead, you make the 9 into a 0, and add the 1 to the 5. So, your final answer for that will be 6! :) Hope this helped! </span>
Of course, √(64h) can be simplified to 8√h. You know that √30 lies between 5 and 6, so the velocity lies between 8·5 = 40 and 8·6 = 48. There is only one answer choice in that range.
