If g is acceleration due to gravity, then the vertical distance travelled by a projectile in time t is equal to.
A
12gt2
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B
gt2
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C
34gt2
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D
none of these
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Solution
The correct option is A12gt2 Initial speed of the projectile in vertical direction is zero i.e. uy=0 Acceleration in the vertical direction ay=g Vertical distance travelled Sy=uyt+12ayt2 ∴Sy=0+12gt2 ⟹Sy=12gt2