b = 0
x = 0
i = 0
while b < 25 do
	x = 0.5 * 9.8 * (b*b)
	i = b
	b = b + 1
	print b, " : "
	while x > 0 do
		print "*"
		x = x - 1
	end
	print "\n"
end
視覚化してみた