[" At high altitudo,a bod m/s upward "],[" two equal fragmonts with one at rest into "],[" receiving horizontal vith one froagment "],[" taken by the velocity volocity of "10m/s" .Time "],[" to make "90^(@)" is "(g=10m/s^(2))],[[" (a) "0.5s," (b) "4],[" (c) "2s," (d) "1s],[" A bullet of mass "20]]