A horizontal line on a speed/time graph means a constant speed.
Answer:ball, ramp, and angle
Explanation: these are the three things that are controls because you can control them
I believe the answer is B, a real and inverted image is formed on the side of the lens opposite the rubber ducky. The focal length is 15 cm and therefore the center of curvature (2F) will be 30 cm. When the object is placed between F and 2F (in this case 20 cm) in front of a convex lens, an inverted, real image is formed on the other side of the lens.
Initial velocity = 
acceleration in the downward direction = -9.8 
Final velocity at the highest point = 0
Maximum height reached = 0.410 m
Now, Using third equation of motion:
Speed with which the flea jumps = 
Answer:
"Why"
Explanation: A scientific law is a description of how the natural world behaves under certain circumstances.
