The particles P and Q are projected simultaneously from two towers as shown. They collide in mid air Then d is
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a
10 m
b
20 m
c
15 m
d
25 m
answer is B.
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Detailed Solution
they together travel a horizontal distance d and vertical distance 20 -10 in time t verical distance travel 12gt2+102sin450t -12gt2=10 solving t=1 horiaontal distance travel in 1 sec (102cos 450+10)1=d d=20 m