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Q.

A marble P is dropped vertically, another identical marble Q is projected horizontally from the top of a tower at same point at the same instant.

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a

P will reach the ground earlier than Q

b

Q will reach the ground earlier than P.

c

Both P and Q will reach the ground at the same instant

d

None of these

answer is C.

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Detailed Solution

for body dropped freely,  In vertical direction , initial velocity=uy =0; acceleration due to gravity=g=9.8m/s2;  for body projected horizontally, In vertical direction , initial velocity=uy =0; acceleration due to gravity=g=9.8m/s2;  as the physical quantities involving vertical displacement are same, both the bodies reach the ground in same time,  On applying Sy=uyt +12gt2;       here Sy=h=height of the tower; uy= vertical direction  initial velocity For both the bodies initial vertical component of velocity is same.hence both  the  bodies will reach the ground simultaneously.
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