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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