A kite remains directly above a point 30 m downwind from the person holding the string. The string is being let out at a rate of 5 m/s. When the length of the string is 50 m, how fast is the kite rising?
a) 4.00 m/s
b) 6.25 m/s
c) 8.33 m/s
d) −6.25 m/s