Time of flight for both particles will be same.
Let time of flight be ‘T’.

Now, 12 = 6T – 3T
T = 4 sec
Also, T = ⇒ H = 1/2 gT²
∴ H = 1/2 (10)(4)² = 80 m
With regards to significant figures 4.000 × 10³ m can be written as
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