The height below the tower at which coin 1 pass coin 2 is 89.04 m.
The given parameters:
height of the tower, h = 100 m
initial velocity of coin 1, v = 15 m/s
time spent in air by coin 1 before coin 2 was dropped = 2s
To find:
- the height below the tower at which coin 1 passes coin 2
Find the maximum height attained by coin 1 before falling to the ground:

Find the time taken for coin 1 to fall to the ground:
Total height of coin 1 above the ground, H = 11.25 m + 100 m = 111.25 m

But the time taken for the coin 1 to reach 11.25 m above the tower:

Total time spent by coin 1 before reaching ground with respect to coin 2:
time = (1.5 s + 4.72 s) - 2 s
time = 4.22 s
<u>Note:</u><em> the 2 s was subtracted to keep both coins at a fair starting time below the tower</em>.
Find the total time taken for coin 2 to fall to the ground:
Height of coin 2 above the ground = 100 m
Total time taken by coin 2 before falling to the ground is calculated as:

The time at which coin 1 will pass coin 2 is 4.22 s.
Find the height below the tower when the time is 4.22 s.

Thus, the height below the tower at which coin 1 pass coin 2 is 89.04 m.
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