How fast a ruler have to move in the direction of its length in order to appear to stationary on looker to be half its proper length?

What is 15 percent off 32.50? How much is 900 less 30 percent? How many significant figures in 10200? How do round 1.51 to 1 decimal place? How Only odd numbers are prime numbers true or false? what describe the exponential growth of species? What are the factor pairs for five? Where are roman numerals still used today? Relative value of 2000 pounds Australian in todays value? What is shaped in a hexagon? If a card is drawn from a deck numbered 1 through 10 and a die is rolled what is the probability of drawing a 10 and a 3? How many times does 17 go into 200? What is sixty seven times forty two? What is x plus y to the 3rd power? What is the ratio reduced to lowest terms thirty one quarters to thirty dollars? How many times can 3 go into 57 and how many times can 3 go into 138? Can less than specified amperage damage radio? What is the largest angle in quadrilateral? Are the data discrete or continuous? How do you put 3150 to a percent?