All of them will have the same density
For harmer:-
initial velocity=u=0m/s
Acceleration due to gravity=10m/s^2
Now



For soft drink:-
u=24m/s

Using eq(1)




After 1.2s they will meet.
Now
putting t in eq(1)

At the height of 7.2m they will meet
Answer:
For mass m 1 newton 2nd law
F=m 1 a 1
5=m 1 ×10
m 1 = 2
1
kg
For mass m 2
F=m 2 a 2
5=m 2
×20
m 2
= 4
1 kg
if tied together
Total mass =m 1 +m 2 = 1/2 +1/4=3/4kg
Now
F=M
T Q
T
a T = 5/m T = 5×4/3 = 3
/20m/s^2
Explanation: