A) The two stones meet after 4 seconds from the start and at a height of 16 m above the ground
B) The two stones meet after 4 seconds from the start and at a height of 20 m above the ground
C) The two stones meet after 6 seconds from the start and at a height of 20 m above the ground
D) The two stones meet after 5 seconds from the start and at a height of 25 m above the ground
E) None of these
Correct Answer: B
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