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Q.

The vertical height of point P above the ground is twice that of Q. A particle is projected downward with a speed of 5 m/s from P and at the same time another particle is projected upward with the same speed from Q. Both particles reach the ground simultaneously, then

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a

PQ=30 m

b

time of flight of stones =3s

c

Both (1) and (2) are correct

d

Both (1) and (2) are wrong

answer is C.

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Detailed Solution

-h=5t-5t2-2h=-5t-5t2From these two equations,we get, t=3sand h= distance between Pand Q=30m
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The vertical height of point P above the ground is twice that of Q. A particle is projected downward with a speed of 5 m/s from P and at the same time another particle is projected upward with the same speed from Q. Both particles reach the ground simultaneously, then