Answer:
21.41 kg-m/s.
Step-by-step explanation:
Data provided
Height = 3.75 m
Mass of stone = 2.50 kg
The computation of impulse is shown below:-
First we will compute the time using motion's equation which is

as,
s indicates height
u indicates initial speed
t indicates time
Now, we will use the equation and put the values

t = 0.874 seconds
After computing the time now we will find put the impulse which is

Now we will put the values into the above formula to reach the impulse

J = 21.41 kg-m/s.