God I hate projectiles.. A PHYS1001 student uses a slingshot to project a pebble at her lecturer (shoulder height) who is standing 40 m away. After extensive experiments she finds that to hit the target she must aim 4.85 m above the target. Determine the velocity of the pebble on leaving the slingshot and the time of flight. Can some one start me off, with the correct formula to use. Im stumped..