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Answer:
b.
Explanation:
vertical distance covered by B
s2 = u sin x × t + 1/2 at^2
= 20 × 1/2 × 1 + 1/2 × -10 × 1^2
= 5 m
vertical distance covered by A
s1 = u × t + 1/2 at^2
= 30 × 1 + 1/2 × -10 × 1^2
= 25
s2 - s1 = 25 - 5 = 20