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Answer :
Option (c) is correct.
Explanation:
initial velocity along horizontal= Vx=15 m/s
initial velocity along vertical= Viy=39 m/s
final vertical velocity at the top= 0
acceleration due to gravity=-9.8 m/s²
using kinematic equation
Vfy²= viy²+2gh
0=(39)²+2 (-9.8) (h)
-1521=-19.6 h
h=77.6 m
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