14. The angle of elevation of a vertically rising hot air balloon changes from 27° at 7.00 am to 61° at 7.03 am, according to an observer who is 300 m away from the take-off point.

a. Assuming a constant speed, calculate the speed (in m/s and km/h) at which the balloon is rising, correct to 2 decimal places.

b. The balloon then falls 120 metres. What is the angle of elevation now? Write your answer correct to 1 decimal place.