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Q.

A ball thrown horizontally with velocity v from the top of a tower of height h reaches the ground in t seconds. If another ball of double the mass is thrown horizontally with velocity 3v from the top of another tower of height 4h it reaches the ground in (seconds)

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a

3t/4

b

t/2

c

4t

d

2t

answer is D.

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Detailed Solution

m1=m, u1=v, h1=h, t1=t

t1=2h1g1

t=2hg→(1)

m2=2m, u2=3v, h2=4h, t2=?

t2=2h2g1

=2(4h)g

=22hg

t2=2t1→(2)

from(1)&(2)

t2=2t

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