This is my catapult, the launching angle in its original form( sits on the ground) is less than 90°(although the arm hits the stopping bar at an 90° .However, i observed that the path of the table tennis ball is a parabola shape. That means the ball is launched at an angle and not 90°):
1)if i do not pull the arm, the arm will be at rest at certain angle because of the spring. Assume the angle to be ?. is the launching angle of the catapult in its original form same as ??
2) if i raise the front of the catapult by certain angle, say X degrees. My lauching angle in this case will be X+?, am i correct? if not, explain plz
When the arm hits the stopping bar, the arm makes a 90° relative to the ground