Usually, Scientists use "Parallax Method" in order to determine the different positions of an object
Hope this helps!
#A
Mass=4.4kg
acceleration=-1.74m/s^2
Use newtons second law



#B
initial velocity=u
Final velocity=v=0
Acceleration=a=-1.74m/s^2
Time=t=1.27s





1. they all come from the clouds 2.they are all formed by precipatation. hope this helps enjoyyyyyy!!!!!!!!!!!!!