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Q.

Two balls are projected simultaneously with the same speed from the top of a tower - one upwards and the other downwards. If they reach the ground in 6s and 2s, the height of the tower is (g = 10 ms–2)

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a

30m

b

120m

c

80m

d

60m

answer is B.

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Detailed Solution

-h=6u-12g×36 h=2u+12g×4 Hence, 8u=16g u= 20 m/s h= 60 m

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