There are various methods to measure acceleration due to gravity. At Higher level all rely on one of the equations of motion. The measurements required will depend on the equation used.

Although we take a lot of scientific knowledge for granted today, each of the basics – whether it be about light, gravity ... he focused specifically on the acceleration of the falling objects ...

Before the parachute opens: Immediately on leaving the aircraft, the skydiver accelerates downwards due to the force of gravity ... still accelerating but its acceleration decreases as time ...