Question 4 (12 points) A piston with a circular base whose weight is 25 N, as shown in figure 3 below separates two chambers with
a
the same fluid at their base.
A
air B
air
D
50 cm
30 cm
C
25 cm
30 cm
E
water
90 cm

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.