Answer:
Free fall experiment
Step-by-step explanation:
When a ruler or lets say any object is dropped from height on to the floor, it is called free fall. A drop object to fall on the floor to study the effects of gravity.The free fall is called movement due solely to the influence of gravity. All bodies with this type of movement have a downward acceleration whose value depends on where they are. The value of acceleration due to gravity on Earth has been found out to be 9.81 m/sec^2.